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
Which of the following is true of chicken pox - 
Select and explain. 
A. Virus not found in scab, B. Virus can be grown on the chick embryo, C. Caused by RNA virus, D. Does not cross the placental barrier
A: Virus not found in scab
Answer: A: Virus not found in scab 
Explanation: The fluid of vesicle of chickenpox contains virus during the first 3 days of illness, but scab is no infective.

About other options
Option b

VZV does not grow in an experimental animal or chick embryo.
It can be grown in tissue culture cell lines → Human fibroblast, HeLa cells, Vero cells.

Option c

VZV is a DNA virus.

Option d

VZV can cross the placenta and infect the fetus.
The baby may develop two types of complications depending on the period of gestation:-