This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'Krukenberg tumor is associated mostly with which cancer? \nSelect and explain. \nA. Stomach, B. Breast, C. Liver, D. Pancreas', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Krukenberg tumor is a distinctive bilateral tumor metastatic to the ovaries by the transcoelomic spread. The tumor is generally secondary to a gastric carcinoma but other primary sites where mucinous carcinomas occur (e.g. colon, appendix, and breast) may also produce Krukenberg tumor in the ovary. Rarely, a tumor having the pattern of Krukenberg tumor is primary in the ovary.Grossly, Krukenberg tumor forms rounded or kidney-shaped firm large masses in both ovaries. Microscopically, it is characterized by the presence of mucus-filled signet ring cells which may lie singly or in clusters. It is accompanied by a sarcoma-like cellular proliferation of ovarian stroma HARSH MOHAN Textbook of pathology 6th edition pg no 750', 'role': 'assistant'}]