This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': 'Most common cause of krukenberg tumor is: \nSelect and explain. \nA. Ovarian cancer, B. Stomach cancer, C. Liver cancer, D. Small bowel cancer', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Stomach cancerRef: Sabiston's Textbook of surgery, 20th edition, Page 1216* Krukenberg tumor is bilateral ovary involvement by transcelomic spread* It is most commonly seen in gastric cancer", 'role': 'assistant'}]