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 0157 : H7 is: 
Select and explain. 
A. O7 culture, B. Sorbitol MacConkey media, C. XLD Agar, D. Deoxycholate Media
B: Sorbitol MacConkey media
Answer: B: Sorbitol MacConkey media 
Explanation: Non- DNA- dependent methods are used for routine diaggnosis of EHEC 0157: H7. This serotype is suggested by isolation of an E-coli that fails to fermant sorbitol on MacConkey sorbitol; latex aggulination confirms. Ref: Kliegman, Behrman, Jenson, Stanton (2008), "Nelson textbook of Pediatrics", Chapter 197, "Escherichia coli", Volume 1, Page 1196; Textbook of Microbiology By Ananihnarayanan, 7th Edition, Page 279; Medical Microbiology By Jawetz, 24th Edition, Page 254; Current Diagnosis and Treatment in Infectious Diseases, 11th Edition, Page 550