Sylvia Has Severe Cystic Acne and Is Taking Accutane,a Drug

Sylvia has severe cystic acne and is taking Accutane,a drug prescribed by her doctor.She has just discovered that she is pregnant.Her doctor should tell her to:

A) continue to take Accutane for her acne until she is 4 months pregnant.
B) stop taking Accutane immediately.
C) continue to take Accutane but be sure to come to her prenatal appointments for regular monitoring of the development of her baby.
D) stop taking Accutane right now,and resume taking it when she is 7 months pregnant.