This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
A 24 year old unmarried woman has multiple nodular, cystic, pustular and comedonicus lesions on face, upper back and shoulders for 2 years. The drug of choice for her treatment: 
Select and explain. 
A. Erythromycin, B. Isotretinoin, C. Doxycycline, D. Azithromycin
B: Isotretinoin
Answer: B: Isotretinoin 
Explanation: Acne is which is multinodular in nature is treated using dofferent types of drugs one of them is isoretinoin which belongs to retinoids family.all others are antibiotics which are given as secondary tretment. Ref: kd tRipathi 8th ed.