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 is an absolute contraindication for combined oral pills : \nSelect and explain. \nA. Diabetes mellitus, B. Hypeension, C. Past history of thromboembolism, D. Hea disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Past history of thromboembolism', 'role': 'assistant'}]