The census in India is conducted every:

The correct answer is: b) 10 years.

The census in India is conducted every 10 years. The first census in India was conducted in 1872. The most recent census was conducted in 2011. The census is used to collect data on the population of India, including age, sex, religion, language, and literacy. The data from the census is used to plan for the development of India.

Option a) is incorrect because the census is not conducted every 5 years. Option c) is incorrect because the census is not conducted every 15 years. Option d) is incorrect because the census is not conducted every 20 years.