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
Spread of chicken pox is maximum ? 
Select and explain. 
A. After formation of scab, B. Just before and after onset of rash, C. One week before onset of rash, D. During convelescence
B: Just before and after onset of rash
Answer: B: Just before and after onset of rash 
Explanation: Ans. is 'b' i.e., Just before and after onset of rash Communicable period (period of maximum infectivity) in chicken pox is 2 days before to 5 days after onset of rash.