This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
The bacteria frequently used as an immunomodulator is 
Select and explain. 
A. Corynebacterium parvum, B. Mycobacterium marinum, C. Chromobacterium violasium, D. Flavobacterium meningosepticum
A: Corynebacterium parvum
Answer: A: Corynebacterium parvum 
Explanation: Corynebacterium parvum, which is frequently used as an immunomodulator, is a mixture of the Propionibacterium species. Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 246