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
Phage typing is useful as an epidemiological tool in all, except ? 
Select and explain. 
A. Salmonella, B. Staph aureus, C. V. cholerae, D. Shigella dysenteriae
D: Shigella dysenteriae
Answer: D: Shigella dysenteriae 
Explanation: Ans. is 'd' i.e., Shigella dysenteriae