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': 'Which one of the following is an adverse effect associated with combined oral contraceptives: \nSelect and explain. \nA. Cerebral stroke, B. Aggravation of asthma, C. Peripheral neuropathy, D. Nephrotic syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]