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: Surgery
[{'content': 'Post operative Pulmonary Thromboembolism is seen in all, except : \nSelect and explain. \nA. Tall and thin man, B. Obese male, C. Pregnant female, D. Oestrogen therapy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]