This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Infectivity of chicken pox last for - 
Select and explain. 
A. Till the last scab falls of, B. 6 days after onset of rash, C. 3 days after onset of rash, D. Till the fever subsides
B: 6 days after onset of rash
Answer: B: 6 days after onset of rash 
Explanation: The incubation period of chickenpox is about 2 weeks. The patient is considered to be infectious during 2 days before and five days after the onset of lesions. REF:ANATHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 8TH EDITION PAGE NO:471