Question: What famous son of Hiroo Johar and the acclaimed producer Yash Johar made his directorial debut with the film, "Kuch Kuch Hota Hai?"
Sentence (from "Karan Johar"): Karan Johar (born 25 May 1972), often informally referred to as KJo, is an Indian film director, producer, screenwriter, costume designer, actor and television personality who is primarily known for his work in Hindi films.
Relevant evidence: No