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': "Norgestimate OCP's have the following advantage except: \nSelect and explain. \nA. Reduces venous thrombosis, B. Is cheaper than standard OCP's, C. Reduces acne and hirsutism, D. Useful in heart disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Remember', 'role': 'assistant'}]