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': 'Which of the following present as acute abdomen \nSelect and explain. \nA. Acute intermittent porphyria, B. Tabes, C. Pneumonitis of lower lobe, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]