This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Tumor marker CA 15-3 is associated with ? \nSelect and explain. \nA. Ovary, B. Breast, C. Prostate, D. Kidney', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Harshmohan textbook of pathology 7th edition tumor marker CA 15-3 is associated with breast cancer. ovary - CA 125 prostate- PSA..', 'role': 'assistant'}]