Whose among the following birth anniversary has been observed as “National Mathematics Day” in India?
[A]Satyendra Nath Bose
[B]P C Mahalano
[C]Srinivasa Ramanujan
[D]S Chandrashekar

Srinivasa Ramanujan
In India, the day December 22 has been declared as the National Mathematics Day. The Indian mathematical genius Srinivasa Ramanujan was born on 22 December 1887 and died on 26 April 1920. It was in recognition of his contribution to mathematics the Government of India decided to celebrate Ramanujan’s birthday as the National Mathematics Day every year and to celebrate 2012 as the National Mathematical Year.