Small pox vaccine was developed by Edward Jenner (ii). Cholera vaccine was developed by Louis Pasteur (iv). The TB vaccine (BCG) is credited to Camille Guerin along with Calmette (iii). Polio vaccine was developed by Jonas E. Salk (i). So (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i), which matches option 2.