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
Ideally immunization against poliomyelitis should be staed at: September 2004 
Select and explain. 
A. Bih, B. 6 weeks, C. 12 weeks, D. 9 months
A: Bih
Answer: A: Bih 
Explanation: Ans. A i.e. Bih