This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-HIV Drugs, Subject name: Pharmacology
In AIDS patients with pregnancy a drug X is not given orally because it consists of propylene glycol. The side effects of this drug are hyper-pigmentation on the palms of the hands and soles of the feet. What is the drug X? 
Select and explain. 
A. Amprenavir, B. Eirenz, C. Emtricitabine, D. Zalcitabine
C: Emtricitabine
Answer: C: Emtricitabine 
Explanation: Oral form amprenavir and emtricitabine having propylene glycol, a toxic compound. The distinctive side effect of emtricitabine is hyperpigmentation. Eirenz found teratogenic in pregnant monkeys and should not be given in first 8 weeks of pregnancy.