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: Microbiology
ELISA is: 
Select and explain. 
A. A name of a scientist, B. A radiologic procedure, C. A pioneer in dentistry, D. An enzymatic immune reaction
D: An enzymatic immune reaction
Answer: D: An enzymatic immune reaction 
Explanation: None