In which of the following cases did the Supreme Court restrict the total reserved quota to 50%?

a) Kaka Kalekar vs Union of India 
 b) B. P. Mandal vs Union of India 
 c) Balaji Raghavan vs Union of India 
 d) Indra Sawhney vs Union of India

Solution: d.

http://www.thehindu.com/opinion/editorial/editorial-on-gujarat-patidar-agitators-a-misguided-surrender/article8537874.ece