As of May 2016, who was the Chairperson of the National Human Rights Commission?

The correct choice is: “Justice H. L. Dattu”

Former Chief Justice of India H. L. Dattu became Chairperson of the National Human Rights Commission on 29 February 2016. The Protection of Human Rights Act, 1993 then required the Chairperson to be a retired Chief Justice of India (since the 2019 amendment, a retired Judge of the Supreme Court is also eligible).

Former Chief Justice K. G. Balakrishnan was his predecessor (2010–2015), and Justice B. S. Chauhan was then Chairman of the Law Commission of India.