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': 'The following tumours commonly metastasis to the ovary, except : \nSelect and explain. \nA. Malignant melanoma, B. Stomach, C. Oesophagus, D. Lymphoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Oesophagus', 'role': 'assistant'}]