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
Granules in the Corynebacterium diphtheria are called by following names, except 
Select and explain. 
A. Metachromatic granules, B. Retractile granules, C. Babes Ernst granules, D. Volutin granules
B: Retractile granules
Answer: B: Retractile granules 
Explanation: None