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': 'Commonest site of Maltoma is \nSelect and explain. \nA. Neck, B. Mediastinum, C. Stomach, D. Vertebra', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stomach is commonest site of Maltoma.', 'role': 'assistant'}]