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
Shigella are be divided into subgroup on the basis of ability to ferment - 
Select and explain. 
A. Lactose, B. Maltose, C. Fructose, D. Mannitol
D: Mannitol
Answer: D: Mannitol 
Explanation: Ans. is 'd' i.e., Mannitol Fermentation of mannitol is of impoance in classification Shigella Mannitol fermenting Mannitol nonfermenting . Sh. flexneri (sub group B) Sh. dysenteriae (sub group A) . Sh boydii (sub group C) . Sh. Sonnei (sub group D)