Lactose nonfermenting are all except -: (A) Shigella sonnei, (B) Shigella dysenteriae, (C) Shigella flexneri, (D) Shigella boydii
Answer is A. Ans. is 'a' i.e., Shigella sonnei * Lactose and sucrose are not fermented except by Sh. Sonnei which ferment them late.