All of the following are killed vaccines – EXCEPT:

Correct option is B

Ans. (b) BCG
Sol. BCG (Bacillus Calmette–Guérin) is a live attenuated vaccine used for tuberculosis prevention. Other options are inactivated or killed vaccines.
Explanation of each option:
· (a) Cholera – Killed (inactivated) vaccine.
· (b) BCG – Correct. Live attenuated vaccine.
· (c) Pertussis – Usually part of DPT; inactivated/killed whole-cell form.
· (d) Tetanus – Inactivated toxoid vaccine.