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': "All of the following are true about Krukenberg's tumor except: \nSelect and explain. \nA. Has a rough surface, B. Shape of ovary is maintained, C. Usually bilateral, D. Arises usually form stomach carcinoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]