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: Medicine
Indirect coombs test detect - 
Select and explain. 
A. Antibodies attached to RBC surface, B. Antigen in serum, C. Antibodies in the serum, D. Antigen attached to RBC surface
C: Antibodies in the serum
Answer: C: Antibodies in the serum 
Explanation: None