This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological oncology, Subject name: Gynaecology & Obstetrics
[{'content': 'The following tumours commonly metastasise to the ovary, except: \nSelect and explain. \nA. Malignant melanoma, B. Stomach, C. Oesophagus, D. Lymphoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: - ovarian metastasis are commonly from the primary growth in the gastrointestinal tract, notably the pylorus. Reference : Shaw's textbook of gynaecology, 16th edition, pg no:524 <\\p>", 'role': 'assistant'}]