This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Chicken pox vaccine is - 
Select and explain. 
A. Live vaccine, B. Killed vaccine, C. Conjugated vaccine, D. None of the above
A: Live vaccine
Answer: A: Live vaccine 
Explanation: Prevention of chickenpox

For prevention of chickenpox, following are used-

i)    Varicella zoster immunoglobulin (VZIG)

VZIG is given within 72 hours of exposure in exposed susceptible individuals.
It is given intramuscularly with a repeat dose in 3 weeks.
Because VZIG bind to the varicella vaccine, the two should not be given concomitantly.

ii) Vaccine

Varicella vaccine is a live attenuated vaccine and is recommended for children between 12-18 months of age.
Efficacy of vaccine is 90 - 95% and the duration of immunity is probably 10 years.
Two doses are recommended in person older than 12 years of age.