You will be given a definition of a task first, then some input of the task.
In this task, you are given a context, a subject, a relation, and many options. Based on the context, from the options select the object entity that has the given relation with the subject. Answer with text (not indexes).

Context: Head of government is a generic term used for either the highest or second highest official in the executive branch of a sovereign state, a federated state, or a self-governing colony, (commonly referred to as countries, nations or nation-states) who often presides over a cabinet, a group of ministers or secretaries who lead executive departments. The term "head of government" is often differentiated from the term "head of state", (e.g. as in article 7 of the Vienna Convention on the Law of Treaties, article 1 of the Convention on the Prevention and Punishment of Crimes against Internationally Protected Persons, including Diplomatic Agents and the United Nations protocol list), as they may be separate positions, individuals, and/or roles depending on the country., Marshal Lon Nol (November 13, 1913 November 17, 1985) was a Cambodian politician and general who served as Prime Minister of Cambodia twice (196667; 196971), as well as serving repeatedly as Defense Minister. He led the military coup of 1970 against Prince Norodom Sihanouk and became the self-proclaimed President of the newly created Khmer Republic, ruling until 1975. He was the founder and leader of the short-lived Social Republican Party, and commander-in-chief of the Khmer National Armed Forces., A prime minister is the most senior minister of cabinet in the executive branch of government, often in a parliamentary or semi-presidential system. In many systems, the prime minister selects and may dismiss other members of the cabinet, and allocates posts to members within the government. In most systems, the prime minister is the presiding member and chairman of the cabinet. In a minority of systems, notably in semi-presidential systems of government, a prime minister is the official who is appointed to manage the civil service and execute the directives of the head of state.
In parliamentary systems fashioned after the Westminster system, the prime minister is the presiding and actual head of government and head of the executive branch. In such systems, the head of state or the head of state's official representative (i.e. the monarch, president, or governor-general) usually holds a largely ceremonial position, although often with reserve powers., The CambodianVietnamese War was an armed conflict between the Socialist Republic of Vietnam and Democratic Kampuchea. The war began with isolated clashes along the land and maritime boundaries of Vietnam and Kampuchea between 1975 and 1977, occasionally involving division-sized military formations. On 25 December 1978, Vietnam launched a full-scale invasion of Kampuchea and subsequently occupied the country and removed the Khmer Rouge government from power., A republic (from ) is a sovereign state, country, or government which is organized with a form of government in which power resides in elected individuals representing the citizen body and government leaders exercise power according to the rule of law. In modern times, the definition of a republic commonly refers to a government which excludes a monarch. Currently, 147 of the world's 206 sovereign states use the word "republic" as part of their official names; not all of these are republics in the sense of having elected governments, nor do all nations with elected governments use the word "republic" in their names., Khmers rouges (French for "Red Khmers" "Khmer Kraham"), more commonly known in English as Khmer Rouge, was the name given to the followers of the Communist Party of Kampuchea in Cambodia. It was formed in 1968 as an offshoot of the Vietnam People's Army from North Vietnam, and allied with North Vietnam, the Viet Cong, and the Pathet Lao during the Vietnam War against the anti-communist forces from 1968 to 1975. The Khmer Rouge emerged victorious in the Cambodian Civil War, overthrew the military dictatorship of the Khmer Republic and installed their own government Democratic Kampuchea in 1975, led by Pol Pot, Nuon Chea, Ieng Sary, Son Sen, and Khieu Samphan. This was followed by the Cambodian genocide from 1975 until 1979, when the Khmer Rouge were finally removed from power by Vietnam in the CambodianVietnamese War. The military power of the Khmer Rouge organization was not broken however, and a long era of guerrilla warfare involving large swaths of the Cambodian countryside began. Many different military factions were involved in the guerrilla war era and it ended around 1994.
The Khmer Rouge organization is remembered especially for orchestrating the Cambodian genocide, which resulted from the enforcement of its social engineering policies. Its attempts at agricultural reform led to widespread famine, while its insistence on absolute self-sufficiency, even in the supply of medicine, led to the death of thousands from treatable diseases such as malaria. Arbitrary executions and torture carried out by its cadres against perceived subversive elements, or during purges of its own ranks between 1975 and 1978, are considered to have constituted genocide., Viet Cong, also known as the National Liberation Front, was a political organization and army that operated in South Vietnam and Cambodia during the Vietnam War. It was allied with North Vietnam and fought against the armies of South Vietnam and the United States. It had both guerrilla and regular army units, as well as a network of cadres who organized peasants in the territory it controlled. Many soldiers were recruited in South Vietnam, but others were from the North. During the war, communist leaders and anti-war spokesmen insisted the Viet Cong was an insurgency indigenous to the South, while the U.S. and South Vietnamese governments portrayed the group as a tool of Hanoi. Although the terminology distinguishes southerners from the northerners, the communist forces were under a single command structure set up in 1958., The Westminster system is a parliamentary system of government modelled after that which developed in the United Kingdom of Great Britain and Northern Ireland. This term comes from the Palace of Westminster, the seat of the British parliament.
The system is a series of procedures for operating a legislature. It is used, or was once used, in the national legislatures and subnational legislatures of most Commonwealth and ex-Commonwealth nations upon being granted responsible government, beginning with the first of the Canadian provinces in 1848 and the six Australian colonies between 1855 and 1890. However, some former colonies have since adopted either the presidential system (Nigeria for example) or a hybrid system (like South Africa) as their form of government., Ieng Sary (24 October 1925 14 March 2013) was a co-founder and senior member of the Khmer Rouge. He was a member of the Central Committee of the Communist Party of Kampuchea led by Pol Pot and served in the 197579 government of Democratic Kampuchea as foreign minister and deputy prime minister. He was known as "Brother Number Three" as he was third in command after Pol Pot and Nuon Chea. His wife, Ieng Thirith (nee Khieu), served in the Khmer Rouge government as social affairs minister. Ieng Sary was arrested in 2007 and was charged with crimes against humanity but died of heart failure before the case against him could be brought to a verdict., The Pathet Lao (Lao: , "Lao Nation") was a communist political movement and organization in Laos, formed in the mid-20th century. The group was ultimately successful in assuming political power in 1975, after the Laotian Civil War. The Pathet Lao were always closely associated with Vietnamese communists. During the civil war, it was effectively organized, equipped and even led by the Army of North Vietnam. They fought against the anti-communist forces in the Vietnam War. Eventually, the term became the generic name for Laotian communists., The Khmer Republic (Khmer: ); also known as the State of Cambodia was the right-wing proUnited States military-led republican government of Cambodia that was formally declared on 9 October 1970. Politically, the Khmer Republic was headed by General Lon Nol and Prince Sisowath Sirik Matak that took power in the 18 March 1970 coup against Prince Norodom Sihanouk, then the country's head of state., Pol Pot ( 19 May 1925 15 April 1998), born Saloth Sar, was a Cambodian politician and revolutionary who led the Khmer Rouge from 1963 until 1997. From 1963 to 1981, he served as the General Secretary of the Communist Party of Kampuchea. As such, he became the leader of Cambodia on 17 April 1975, when his forces captured Phnom Penh. From 1976 to 1979, he also served as the Prime Minister of Democratic Kampuchea., Son Sen (June 12, 1930 June 10, 1997) was a Cambodian Communist politician and soldier. A member of the Central Committee of the Communist Party of Kampuchea/Party of Democratic Kampuchea, the "Khmer Rouge", from 1974 to 1992, Sen oversaw the Party's security apparatus, including the "Santebal" secret police and the notorious security prison S-21 at Tuol Sleng., Nuon Chea (born Lau Kim Korn, 7 July 1926), also known as Long Bunruot or Rungloet Laodi, is a Cambodian former communist politician who was the chief ideologist of the Khmer Rouge., The Cambodian Civil War was a military conflict that pitted the forces of the Communist Party of Kampuchea (known as the Khmer Rouge) and their allies the Democratic Republic of Vietnam (North Vietnam) and the Viet Cong against the government forces of the Kingdom of Cambodia and, after October 1970, the Khmer Republic, which were supported by the United States (U.S.) and the Republic of Vietnam (South Vietnam)., Norodom Sihanouk (31 October 192215 October 2012) was the King of Cambodia from 1941 to 1955 and again from 1993 to 2004. Affectionately known to the Cambodian people as Samdech Euv (father prince), Sihanouk became king in 1941. After the Second World War, he campaigned for Cambodia's independence from French rule, which took place in 1953. In 1955, Sihanouk abdicated the throne in favour of his father Norodom Suramarit, and went on to form the political organisation Sangkum. Sihanouk led the Sangkum to victory in the 1955 general elections, and became the Prime Minister of Cambodia. After his father's death in 1960, Sihanouk introduced a constitutional amendment which made him the Head of State of Cambodia, a position which he held until 1970. Between 1955 and 1970, Sihanouk governed Cambodia under one-party rule, and cracked down on political dissent from the Democrat party and Pracheachon. While he was officially neutral in foreign relations, in practice he was friendlier toward communist countries, particularly China, than to the United States and its anti-Communist allies., Kampuchea (Khmer: , "Kampchea"), officially known as Democratic Kampuchea (Khmer: , "Kampchea Pracheathippadey") (DK) from 5 January 1976, was the name of the Khmer Rouge (KR)-controlled state that, between 1975 and 1979, existed in present-day Cambodia. It was founded when the Khmer Rouge forces defeated the Khmer Republic of Lon Nol in 1975. During its rule between 1975 and 1979, the state and its ruling Khmer Rouge regime was responsible for the deaths of millions of Cambodians through forced labour and genocide. After losing control of most of Cambodian territory to Vietnamese occupation, it survived as a rump state supported by China. In June 1982, the Khmer Rouge formed the Coalition Government of Democratic Kampuchea with two non-communist guerilla factions, which retained international recognition. The state was renamed Cambodia in 1990 in the run up to the UN-sponsored Paris Peace Agreement conference of 1991., Vietnam, officially the Socialist Republic of Vietnam (SRV), is the easternmost country on the Indochina Peninsula in Southeast Asia. With an estimated 90.5 million inhabitants , it is the world's 14th-most-populous country, and the eighth-most-populous Asian country. Vietnam is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, Thailand across the Gulf of Thailand to the southwest, and the Philippines, Malaysia and Indonesia across the South China Sea to the east and southeast. Its capital city has been Hanoi since the reunification of North and South Vietnam in 1976., A head of state (or chief of state) is the public persona that officially represents the national unity and legitimacy of a sovereign state. In developing the current Constitution of France (1958), former French president Charles de Gaulle said the head of state should embody "the spirit of the nation" (""). In some countries, typically those with parliamentary governments, the head of state is a ceremonial figurehead that does not actually guide day-to-day government activities and may not even be empowered to exercise any kind of political authority (e.g., Queen Elizabeth II in the United Kingdom). In other countries, the head of state is also the head of government, such as in the U.S., where the president is both a public figurehead and the actual highest ranking political leader who, in practice, oversees the executive branch., Malaria is a mosquito-borne infectious disease affecting humans and other animals caused by parasitic protozoans (a group of single-celled microorganisms) belonging to the "Plasmodium" type. Malaria causes symptoms that typically include fever, fatigue, vomiting, and headaches. In severe cases it can cause yellow skin, seizures, coma, or death. Symptoms usually begin ten to fifteen days after being bitten. If not properly treated, people may have recurrences of the disease months later. In those who have recently survived an infection, reinfection usually causes milder symptoms. This partial resistance disappears over months to years if the person has no continuing exposure to malaria.
The disease is most commonly transmitted by an infected female "Anopheles" mosquito. The mosquito bite introduces the parasites from the mosquito's saliva into a person's blood. The parasites travel to the liver where they mature and reproduce. Five species of "Plasmodium" can infect and be spread by humans. Most deaths are caused by "P.falciparum" because "P.vivax", "P.ovale", and "P.malariae" generally cause a milder form of malaria. The species "P.knowlesi" rarely causes disease in humans. Malaria is typically diagnosed by the microscopic examination of blood using blood films, or with antigen-based rapid diagnostic tests. Methods that use the polymerase chain reaction to detect the parasite's DNA have been developed, but are not widely used in areas where malaria is common due to their cost and complexity.
The risk of disease can be reduced by preventing mosquito bites through the use of mosquito nets and insect repellents, or with mosquito control measures such as spraying insecticides and draining standing water. Several medications are available to prevent malaria in travellers to areas where the disease is common. Occasional doses of the combination medication sulfadoxine/pyrimethamine are recommended in infants and after the first trimester of pregnancy in areas with high rates of malaria. Despite a need, no effective vaccine exists, although efforts to develop one are ongoing. The recommended treatment for malaria is a combination of antimalarial medications that includes an artemisinin. The second medication may be either mefloquine, lumefantrine, or sulfadoxine/pyrimethamine. Quinine along with doxycycline may be used if an artemisinin is not available. It is recommended that in areas where the disease is common, malaria is confirmed if possible before treatment is started due to concerns of increasing drug resistance. Resistance among the parasites has developed to several antimalarial medications; for example, chloroquine-resistant "P.falciparum" has spread to most malarial areas, and resistance to artemisinin has become a problem in some parts of Southeast Asia.
The disease is widespread in the tropical and subtropical regions that exist in a broad band around the equator. This includes much of Sub-Saharan Africa, Asia, and Latin America. In 2015, there were 214 million cases of malaria worldwide resulting in an estimated 438,000 deaths, 90% of which occurred in Africa. Rates of disease have decreased from 2000 to 2015 by 37%, but increased from 2014 during which there were 198 million cases. Malaria is commonly associated with poverty and has a major negative effect on economic development. In Africa, it is estimated to result in losses of US$12 billion a year due to increased healthcare costs, lost ability to work, and negative effects on tourism., Khieu Samphan (born 27 July 1931) is a former Cambodian communist politician who was the chairman of the state presidium of Democratic Kampuchea (Cambodia) from 1976 until 1979. As such, he served as Cambodia's head of state and was one of the most powerful officials in the Khmer Rouge movement, although Pol Pot remained the General Secretary (highest official) in the party. Khieu Samphan is the second oldest living former Khmer Rouge leader, alongside Nuon Chea. On 7 August 2014, they were convicted and received life sentences for crimes against humanity during the Cambodian Genocide., Sisowath Sirik Matak (January 22, 1914April 21, 1975) was a member of the Cambodian royal family, the Varman dynasty, under the House of Sisowath., North Vietnam, officially the Democratic Republic of Vietnam (DRV), was a state in Southeast Asia which existed from 1945 to 1976. Vietnamese revolutionary leader Ho Chi Minh declared independence from France on 2 September 1945 and announced the creation of the Democratic Republic of Vietnam. France reasserted its colonial dominance and a war ensued between France and the Viet Minh, led by Ho. The Viet Minh ("League for the Independence of Vietnam") was a coalition of nationalist groups, mostly led by communists. In February 1951, the communists announced the creation of the Lao ng Party (Labor Party), gradually marginalizing non-communists in the Viet Minh., The Vietnam War, also known as the Second Indochina War, and known in Vietnam as Resistance War Against America or simply the American War, was a war that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. It was the second of the Indochina Wars and was officially fought between North Vietnam and the government of South Vietnam. The North Vietnamese army was supported by the Soviet Union, China and other communist allies and the South Vietnamese army was supported by the United States, South Korea, Australia, Thailand and other anti-communist allies and the war is therefore considered a Cold War-era proxy war., Long Boret or Long Boreth ( January 3 , 1933 -- April 17 , 1975 ) was a Cambodian politician who served as Prime Minister of the Khmer Republic from December 26 , 1973 to April 17 , 1975 . Highly regarded for his honesty , he tried unsuccessfully to negotiate a peace settlement with the Khmer Rouge during the Cambodian Civil War . He was later arrested by the Khmer Rouge and executed ., Subject: long boret, Relation: date_of_death, Options: (A) 1 november 1955 (B) 10 (C) 12 (D) 13 (E) 14 (F) 147 (G) 17 (H) 17 april 1975 (I) 18 (J) 1848 (K) 19 (L) 1913 (M) 1925 (N) 1930 (O) 1931 (P) 1941 (Q) 1945 (R) 1951 (S) 1958 (T) 1963 (U) 1966 (V) 1968 (W) 1969 (X) 1970 (Y) 1975 (Z) 1976 ([) 1977 (\) 1978 (]) 1979 (^) 1985 (_) 1990 (') 1992 (a) 1993 (b) 1994 (c) 2 (d) 2 september 1945 (e) 2004 (f) 2007 (g) 2012 (h) 2013 (i) 2015 (j) 214 (k) 22 (l) 24 (m) 24 october 1925 (n) 25 (o) 25 december 1978 (p) 27 (q) 27 july 1931 (r) 31 (s) 37 (t) 438 (u) 67 (v) 7 (w) 7 july 1926 (x) 71 (y) 79 (z) 9 october 1970 ({) 90 (|) december 1978 (}) march 2013 (~) may 1925 () october 1970 () october 2012
Output:
17 april 1975