Which of the following is true of chicken pox -
Virus not found in scab
Virus can be grown on the chick embryo
Caused by RNA virus
Does not cross the placental barrier
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:-