instruction:
In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
question:
Question: Which professional ice hockey league that McNab ever played in was formed first? Passage:After playing junior hockey in Saskatoon, Saskatchewan, McNab played on the Omaha Knights of the USHL in the 1946–48 season before being called up to the Detroit Red Wings of the National Hockey League in 1947. He would play on and off with the Red Wings until 1951, playing on the team that won the Stanley Cup in 1950. He played for the Indianapolis Capitols of the American Hockey League in 1950–51. Before the 1951–52 season, he was traded by the Red Wings to the Chicago Black Hawks, but never played for the team. Back surgery kept him out of action in 1951–52 and McNab then joined the New Westminster Royals of the Western Hockey League, where he played for seven seasons, retiring in 1959. He was voted league MVP in 1955, scoring 32 goals and 81 points.
 Links: a. Omaha Knights (AHA) b. Saskatoon c. National Hockey League d. United States Hockey League (1945–1951)
answer:
d


question:
Question: How many people died in the incident that contaminated about 30,000 km?  Passage:Natural strontium is a mixture of four stable isotopes: Sr, Sr, Sr, and Sr. Their abundance increases with increasing mass number and the heaviest, Sr, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic Sr as the daughter of long-lived beta-decaying Rb. Of the unstable isotopes, the primary decay mode of the isotopes lighter than Sr is electron capture or positron emission to isotopes of rubidium, and that of the isotopes heavier than Sr is electron emission to isotopes of yttrium. Of special note are Sr and Sr. The former has a half-life of 50.6 days and is used to treat bone cancer due to strontium's chemical similarity and hence ability to replace calcium. While Sr (half-life 28.90 years) has been used similarly, it is also an isotope of concern in fallout from nuclear weapons and nuclear accidents due to its production as a fission product. Its presence in bones can cause bone cancer, cancer of nearby tissues, and leukemia. The 1986 Chernobyl nuclear accident contaminated about 30,000 km with greater than 10 kBq/m with Sr, which accounts for 5% of the core inventory of Sr.
 Links: a. Rubidium b. Mass number c. Electron capture d. Chernobyl disaster
answer:
d


question:
Question: How long did the conflict where Rashid participated as a junior non-commissioned officer last? Passage:Ashraf Rashid joined in the Pakistan Army in 1964 and had participated in Indo-Pakistani War of 1965 as a junior non-commissioned officer (JNCO). Rashid entered the Pakistan Military Academy in 1966. He graduated two years later and joined the Pakistan Army at the rank of lieutenant. He was selected for the Special Service Group unit, and was sent to United States U.S. Special Forces training school to complete his training. Rashid graduated from the Command and General Staff College in Fort Leavenworth, Kansas. He served in the Indo-Pakistani War of 1971 and participated in the conflict as a captain, during which he was permanently injured on the right cheek. As a special service officer, Rashid was promoted as a Brigadier-General and was later sent to Siachen where he along with then-Brigadier-General Parvez Musharraf, participated in the conflict. In 1995, he was promoted as a major-general and was made commandant of his unit. He was an instrumental for conducting paramilitary operations and infiltrating Kashmiri militants in the Kargil War. He resigned from his position and left the special forces as the failure of Kargil operation which he was widely blamed for.
 Links: a. United States Army Command and General Staff College b. Pakistan Military Academy c. Brigadier general d. Indo-Pakistani War of 1965
answer:

d