This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Oral contraceptive pills can cause all except: \nSelect and explain. \nA. Mastalgia, B. Dysmenorrhea, C. Chloasma, D. Breakthrough bleeding', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Side effects of OCPs are breakthrough bleeding, mastalgia, chloasma, carbohydrate intolerance, weight gain. No dysmennorhea is seen.(Ref.Essentials of medical pharmacology TD Tripathi 7th edition page no.325)', 'role': 'assistant'}]