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: Pathology
[{'content': 'Ca 125 is used for \nSelect and explain. \nA. Follow up of ovarian cancer, B. Diagnosis of pancreatic cancer, C. Diagnosis of stomach cancer, D. Diagnosis of ovarian cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Harshmohan textbook of pathology 7th edition. ☆ CA 125 is a tumor marker of ovarian cancer. Most commonly used for follow up of ovarian cancer. ☆ pancreas tumor marker CA 19-9.', 'role': 'assistant'}]