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
Persistant diarrhea is caused by - 
Select and explain. 
A. ETEC, B. EPEC, C. EEC, D. EAEC
D: EAEC
Answer: D: EAEC 
Explanation: Ans. is 'd' i.e., EAEC