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': 'Commonest Primary site of Kurkenberg tumour is: \nSelect and explain. \nA. Breast, B. Colon, C. Stomach, D. Small intestine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stomach', 'role': 'assistant'}]