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
Culture media used for diagnosis of EHEC O157:H7 is- 
Select and explain. 
A. O culture, B. Sorbitol MacConkey media, C. XLD agar, D. Deoxycholate media
B: Sorbitol MacConkey media
Answer: B: Sorbitol MacConkey media 
Explanation: EHEC can be differentiated from other E.coli as it is sorbitol non fermenter, hence it produces colorless colony on Sorbitol MacConkey media whereas others can ferment sorbitol producing pink colony.