Title: Standing army
Content:  A standing army is a permanent, often professional, army. It is composed of full-time soldiers who may be either career soldiers or conscripts. It differs from army reserves, who are enrolled for the long term, but activated only during wars or natural disasters, and temporary armies, which are raised from the civilian population only during a war or threat of war and disbanded once the war or threat is over. Standing armies tend to be better equipped, better trained, and better prepared for emergencies, defensive deterrence, and particularly, wars. The term dates from approximately 1600 CE, although the phenomenon it describes is much older.
Title: Indian Armed Forces
Content:  The Indian Army is a voluntary service, the military draft having never been imposed in India. It is one of the largest standing armies (and the largest standing volunteer army) in the world, with 1,237,000 active troops and 800,000 reserve troops. The force is headed by the Chief of Army Staff of the Indian Army, General Manoj Mukund Naravane. The highest rank in the Indian Army is Field Marshal, but it is a largely ceremonial rank and appointments are made by the President of India, on the advice of the Union Cabinet of Ministers, only in exceptional circumstances. (See Field Marshal 
Title: United States Armed Forces
Content:   As of 31 December 2010, U.S. Armed Forces troops were stationed in 150 countries; the number of non-contingent deployments per country ranges from 1 in Suriname to over 50,000 in Germany. Some of the largest deployments are: 103,700 in Afghanistan, 52,440 in Germany (see list), 35,688 in Japan (USFJ), 28,500 in South Korea (USFK), 9,660 in Italy and 9,015 in the United Kingdom. These numbers change frequently due to the regular recall and deployment of units. Altogether, 77,917 military personnel are located in Europe, 141 in the former Soviet Union, 47,236 in East Asia and the Pacific, 3,362 in North Africa, the Near East and South Asia, 1,355 in sub-Saharan Africa and 1,941 in the Western Hemisphere excluding the United States itself.
Title: China
Content:  With nearly 2.2 million active troops, the People's Liberation Army (PLA) is the largest standing military force in the world, commanded by the Central Military Commission (CMC). China has the second-biggest military reserve force, only behind North Korea. The PLA consists of the Ground Force (PLAGF), the Navy (PLAN), the Air Force (PLAAF), the Rocket Force (PLARF) and the Strategic Support Force (PLASSF). According to the Chinese government, military budget for 2017 totalled US$151.5 billion, constituting the world's second-largest military budget, although the military expenditures-GDP ratio with 1.3% of GDP is below world average. However, many authorities – including SIPRI and the U.S. Office of the Secretary of Defense claim that China hides its real level of military spending, which is allegedly much higher than the official budget. China boasts the world's third-most powerful military, with the world's third-largest stockpile of nuclear weapons.
Title: Active duty
Content:  The Indian Armed Forces are considered to be one of the largest active service forces in the world, with almost 1.42 million Active Standing Army. An additional 2.20 million reserve forces can be activated in a few weeks depending on the situation under the order of the President of India who is the Commander and Chief of the Armed Forces of India. This does not include the additional 1 million troops of the Paramilitary who too are an active force whose full-time responsibility is to guard the sovereignty of the nation from internal and external threats.
Title: Indian Army
Content:  been an active participant in numerous United Nations peacekeeping missions, including those in Cyprus, Lebanon, Congo, Angola, Cambodia, Vietnam, Namibia, El Salvador, Liberia, Mozambique, South Sudan, and Somalia. The Indian Army is operationally and geographically divided into seven commands, with the basic field formation being a division. Below the division level are permanent regiments that are responsible for their own recruiting and training. The army is an all-volunteer force and comprises more than 80% of the country's active defence personnel. It is the largest standing army in the world, with 1,237,117  active troops and 960,000 reserve troops. The army has embarked on an infantry modernisation program known as Futuristic Infantry Soldier As a System (F-INSAS), and is also upgrading and acquiring new assets for its armoured, artillery, and aviation branches.
Title: North Korea
Content:   The North Korean armed forces, or the Korean People's Army (KPA), is estimated to comprise 1,280,000 active and 6,300,000 reserve and paramilitary troops, making it one of the largest military institutions in the world. With an active duty army consisting of NaN% of its population, the KPA is the fourth largest active military force in the world behind China, India and the United States. About 20 percent of men aged 17–54 serve in the regular armed forces, and approximately one in every 25 citizens is an enlisted soldier. UN sanctions on North Korea have made it difficult for the KPA 
Title: Indian Armed Forces
Content:  million active personnel, it is the world's second-largest military force and has the world's largest volunteer army. It also has the third-largest defence budget in the world. As per 2015 Credit Suisse report, the Indian Armed Forces is the world's fifth-most powerful military, whereas the 2020 GlobalFirepower report lists it as the fourth most-powerful military. It is important to note that the Central Armed Police Forces, which are referred to as 'Armed Police Forces' are not armed forces. As such they are headed by civilian officers from the Indian Police Service and are under the control of the Ministry of Home Affairs, not the Ministry of Defence. The Indian 
Title: Military Power of the People's Republic of China
Content: The People's Liberation Army Ground Force (PLAGF) is the largest standing ground force in the world as of 2019, and continued to transition into a modern, mobile and lethal ground force by fielding upgraded combat systems and communications equipment and enhancing its ability to conduct and manage complex combined-arms and joint operations. The PRC has one of the world’s largest forces of advanced long-range surface-to-air missile systems — including Russian-built S-400s, S-300s, and domestically produced Hong Qi systems — that constitute part of its robust and redundant integrated air defense system (IADS) architecture. ; The People's Liberation Army Navy (PLAN) 
Title: Army group
Content:  An army group is a military organization consisting of several field armies, which is self-sufficient for indefinite periods. It is usually responsible for a particular geographic area. An army group is the largest field organization handled by a single commander—usually a full general or field marshal—and it generally includes between 400,000 and 1,000,000 soldiers. In the Polish Armed Forces and former Soviet Red Army an army group was known as a Front. The equivalent of an army group in the Imperial Japanese Army was a "general army" (Sō-gun (総軍)). Army groups may be multi-national formations. For example, during World War II, the Southern Group of Armies (also known as the U.S. 6th Army Group) comprised the U.S. Seventh Army and the French First Army; the 21st Army Group comprised the British Second Army, the Canadian First Army and the US Ninth Army. In both Commonwealth and U.S. usage, the number of an army group is expressed in Arabic numerals (e.g., "12th Army Group"), while the number of a field army is spelled out (e.g., "Third Army").

Question: who has the world's largest standing army?
Answer: China.
South Korea.