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
Enterohemorrhagic, enterotoxigenic and enteroin enteroinvasive are types of: 
Select and explain. 
A. E. coli, B. Klebsiella, C. Shigella, D. Streptococcus pneumoniae
A: E. coli
Answer: A: E. coli 
Explanation: Ans. a. E. coli