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: Gynaecology & Obstetrics
[{'content': "Which of the following OCP's have the least amount of estrogen: \nSelect and explain. \nA. Mala N, B. Triquilar, C. Femilon, D. Novelon", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]