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
Serous papillary cystadenocarcinomas of the ovaries express 
Select and explain. 
A. CA-125, B. CA-19, C. CEA, D. AFP
A: CA-125
Answer: A: CA-125 
Explanation: CA-125