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': 'Side effects of oral contraceptives are all EXCEPT: \nSelect and explain. \nA. Irregular bleeding, B. Headache, C. Thrombosis, D. Increased risk of ovarian cancer', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Irregular bleeding or amenorrhoea can occur if oral contraceptives are given continuously. Estrogen can cause headache, thrombosis and endometrial carcinoma. OCP decrease the risk of ovarian cancer (REF.Essentials of Pharmacology TD TRIPATHI 6th EDITION page no 309)', 'role': 'assistant'}]