Bollywood director and producer Karan Johar's children Yash and Roohi were born to a surrogate mother at the Masrani Hospital in Andheri West. Pics/ Datta kumbhar, Rane Ashish

As filmmaker Karan Johar shared the happy news of the birth of his twins - named Yash and Roohi in honour of his parents - it has once again put the spotlight on the controversial Surrogacy (Regulation) Bill, 2016, which threatens to put the surrogacy option out of reach for singles who want to become parents.