Which noted playwright wrote the screen play for the much acclaimed film 'Manthan'?

Vijay Tendulkar wrote the screenplay for 'Manthan' (1976), a acclaimed film directed by Shyam Benegal about India's milk cooperative movement. Tendulkar was a renowned Marathi playwright known for his realistic and socially relevant works. Girish Karnad and Feroze Khan were also notable playwrights but did not write this film.