This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
SA-14-14-2- 
Select and explain. 
A. Deploid cell inactivated, B. Killed vaccine, C. Life long immunity, D. Primary immunization 2 doses
C: Life long immunity
Answer: C: Life long immunity 
Explanation: SA 14-14-2 strain is live attenuated vaccine whuch offers life ling immunity.Ref.PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 21st edition page no 261