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
In vitro test for enterotoxin - 
Select and explain. 
A. Mac Conckey's culture, B. Blood agar culture, C. Rabbit ileal loop culture, D. None
D: None
Answer: D: None 
Explanation: Ans. is 'd' i.e., None . MacConKey's and blood agar culture are not used for detection of enterotoxin. . Rabbit ileal loop culture is in vivo test (not in vitro)