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
[{'content': "In vitro test for enterotoxin - \nSelect and explain. \nA. Mac Conckey's culture, B. Blood agar culture, C. Rabbit ileal loop culture, D. None", 'role': 'user'}, {'content': "Answer: D \nExplanation: 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)", 'role': 'assistant'}]