This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Ehrlich phenomenon seen in: 
Select and explain. 
A. Proteus, B. Mycobacterium TB, C. Corynebacterium, D. Staphylococcus
C: Corynebacterium
Answer: C: Corynebacterium 
Explanation: Ans. is 'c' i.e., Corynebacterium(It is due to presence in toxin preparation of varying amounts of toxoid and antitoxin to combine in varying proportions and is called Ehrlich phenomenon).Ehrlich defined the minimum lethal dose (MLD) of the diphtheria toxin as the least amount of toxin required to kill a guinea pig weighing 250g within 96 hours after subcutaneous inoculation.