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
Chicken pox is infective 
Select and explain. 
A. 2 days before and 5 days after rash appearance, B. 2 days before and 2 days after rash appearance, C. 4 days before and 4 days after rash appearance, D. 4 days before and 5 days after rash appearance
A: 2 days before and 5 days after rash appearance
Answer: A: 2 days before and 5 days after rash appearance 
Explanation: None