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
Carcinoma of lung, breast marker is - 
Select and explain. 
A. CEA, B. AFP, C. 11CG, D. CA-15-3
A: CEA
Answer: A: CEA 
Explanation: Ans. is 'a' i.e., CEA o Carcinoembryonic antigen is a marker in cancer of colon, pancreas, lung, breast, and ovary.