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
Which of the following is late lactose fermenter: 
Select and explain. 
A. E. coli, B. Klebsiella, C. Salmonella, D. Shigella sonnei
D: Shigella sonnei
Answer: D: Shigella sonnei 
Explanation: Ans. is. 'd' i. e., Shigella sonnei