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
[{'content': 'Which non-diphtheria corynebacterium is used as immunomodulator? \nSelect and explain. \nA. C. diphtheriae, B. C. parvum, C. C.hofmanni, D. C.pseudotuberculosis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., C. parvumThe immunomodulator Corynebacterium parvum stimulates the reticuloendothelial system and causes splenic hypertrophy. The ability of C parvum to stimulate splenic regeneration in hemisplenectomized mice and decrease susceptibility to intranasal pneumococcal challenge was studied.", 'role': 'assistant'}]