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
Ca 125 is used in diagnosis of - 
Select and explain. 
A. Ovarian cancer, B. Gall bladder cancer, C. Carcinoids, D. Bronchogenic cancer
A: Ovarian cancer
Answer: A: Ovarian cancer 
Explanation: None