British Indian Medical Service (IMS) organization began with the establishment of the Bengal Medical Service on 20 October 1763 after that by 1764 in both Madras and Bombay also. In Bengal, increasing military actions required the separation of Military Surgeons from Civil Surgeons. The first Indian to join the service was Soorjo Coomar Goodeve Chuckerbutty who entered the service on 24 January 1855 followed by Rajendra Chandra Chandra on 27 January 1858. The Medical Services of the Madras, Bengal and Bombay Presidencies were united after 1857. Hence the correct answer is option C.