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
Mesothelioma marker is 
Select and explain. 
A. CK 7, B. CK 12, C. CK 22, D. CK 24
A: CK 7
Answer: A: CK 7 
Explanation: None