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: Pharmacology
[{'content': 'Ingestion of which of the following drug during pregnancy increase the risk of vaginal adenocarcinoma in a female offspring? \nSelect and explain. \nA. Chlorpropamide, B. Progesterone, C. Diethyl stilbestrol, D. Chloramphenacol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ingestion of diethylstibestrol during pregnancy increase the risk of vaginal adenocarcinoma in female offspring after maturity. It is also associated with an increase in functional abnormalities of the reproductive tracts in both male and female offsprings.', 'role': 'assistant'}]