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
Babes - Ernst bodies are characteristically seen in? 
Select and explain. 
A. Diphtheria bacilli, B. Anthrax bacilli, C. Borrelia, D. Gonococci
A: Diphtheria bacilli
Answer: A: Diphtheria bacilli 
Explanation: When Diphtheria bacilli are stained with Loeffler's methylene blue, the granules take up a bluish purple colour and hence they are metachromatic granules. They are also called as volutin / Babes Ernst granules. They are situated at the poles of bacilli so called polar bodies. Stains like - Albe's, Neisser's, Ponder's have been used for demonstrating the granules. Do You Know: Intradermal test which provide information regarding immune status and hypersensitivity to diphtheria toxin is Schick test.