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: Surgery
[{'content': 'Sister Mary Joseph nodule is also known as nodular umbilicus. It is MOST commonly seen with: \nSelect and explain. \nA. Ovarian cancer, B. Stomach cancer, C. Colon cancer, D. Pancreatic cancer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A Sister Mary Joseph node is a metastasis manifesting as a periumbilical nodule secondary to abdominal or pelvic cancers. It is commonly due to gastric carcinoma. Ref: Corbett S.W., Stack L.B., Knoop K.J. (2010). Chapter 7. Chest and Abdomen. In K.J. Knoop, L.B. Stack, A.B. Storrow, R.J. Thurman (Eds), The Atlas of Emergency Medicine, 3e.', 'role': 'assistant'}]