Question: What is the cause of death of director of film Kaala Patthar?
Sentence (from "Yash Chopra"): Chopra directed three more romantic films, all starring Khan; "Dil To Pagal Hai" (1997), "Veer-Zaara" (2004) and "Jab Tak Hai Jaan" (2012), before announcing his retirement from direction in 2012.
Relevant evidence: No