This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Which of the following is not a pathogenic mycobacteria - \nSelect and explain. \nA. M. kansasii, B. M. scrofulaceum, C. M. chelonae, D. M. smegmatis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: According to RUNYON classification atypical mycobacterium is classified under RAPID GROWERS which include M.chelonie, M.fouitum, M.smegmatis, M.abscess, M.phlei. Non pathogenic- M. smegmatis M. kansasii- Pulmonary disease resembling tuberculosis M. scrofulaceum- Cervical lymphadenitis M. chelonae- chronic abscess', 'role': 'assistant'}]