Which of the people with which S. K. Sikka played a crucial role was an Indian physicist who is best known for his role in India's nuclear program during its early stages?
S. K. Sikka:  He is known to have played a crucial role, along with Raja Ramanna, Rajagopala Chidambaram and Basanti Dulal Nagchaudhuri, in the design and development of a Hydrogen Bomb by India, which was tested at the Pokhran Test Range in May 1998, under the code name, Operation Shakthi. Raja Ramanna: Raja Ramanna "ರಾಜಾ ರಾಮಣ್ಣ" (Kannada) (28 January 1928 – 24 September 2004) was an Indian physicist who is best known for his role in India's nuclear program during its early stages.
Raja Ramanna