Which largely self-taught Indian mathematician made extraordinary contributions to number theory, infinite series, and continued fractions, inspiring a biography titled 'The Man Who Knew Infinity'?

• A Srinivasa Ramanujan ✓
• B Satyendra Nath Bose
• C Prasanta Chandra Mahalanobis
• D Harish-Chandra

Srinivasa Ramanujan (1887-1920) produced nearly 3,900 results with almost no formal training, collaborating with G.H. Hardy at Cambridge and becoming a Fellow of the Royal Society.