when was the last census conducted in India?
A. 2011
B. 2009
C. 2010
D. 2012

Hint: A census is the process of systematically enumerating, obtaining, and recording information about members of a given population. The term is mainly used in the national population and housing census; other general censuses include agricultural census, traditional culture census, business census, supply census, and traffic census.

Complete step by step answer:
The decennial census in India has been conducted 15 times since 2011. Although it is conducted every 10 years, the first full census was carried out in 1881 from 1872 under the British Viceroy Lord Mayo. After 1949 it was carried out by the Secretary-General and Commissioner of the Indian Census at the Indian Ministry of Interior. All 1951 censuses were conducted under the Indian Census Act 1948. The last censuses were conducted in 2011 and the next in 2021. According to a preliminary report released on March 31, 2011, India's population has increased to 1.21 billion, with a decimal growth of 17.70 percent. Adult literacy increased to 74.04 percent with a decimal increase of 9.21 percent. The motto of the census is "Our Census, Our Future".
So, the correct answer is Option A.

Note: In the 2011 census of India, At the request of several leaders of the ruling coalition including Lalu Prasad Yadav and Mulayam Singh Yadav, the opposition Bharatiya Janata Party, Akali Dal with the support of Shiv Sena and Anna Dravida Munnetra Kazhagam, information about castes have been included in the census.