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: Pediatrics
Which of the following vaccines has maximum efficacy after a single dose - 
Select and explain. 
A. Tetanus toxoid, B. DPT, C. Measles, D. Typhoid
C: Measles
Answer: C: Measles 
Explanation: Ans. is 'c' i.e., Measles