Which British-era census is commonly cited as the last published comprehensive caste-census baseline, rather than the last census in which caste information was collected?

Explanation

1931 is the published comprehensive caste-census baseline commonly cited for British India. Caste information was also collected in 1941, but the comprehensive results were not published. It is therefore inaccurate to describe 1931 as the last occasion on which caste data was collected.