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
[{'content': 'Which of the following is a slow grower: \nSelect and explain. \nA. M. kansasii, B. M. chenolae, C. M. fouitum, D. M. abscessus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) M. Kansasii M. kansasii is a slow growing atypical mycobacteria belonging to photochromogens. Other options M. fouitum and M. Chelonai belong to Group IV of atypical mycobacteria (rapid growers ) and their colony usually appear within seven days. Mycobacterium abscess is a rapidly growing mycobacterium that is a common water contaminant. It can cause chronic lung disease, post-traumatic wound infections, and disseminated cutaneous diseases, mostly in patients with suppressed immune systems. Note: M. abscessus and M. chelonae can be distinguished from M. fouitum by their failure to reduce nitrate and to take up iron. Tolerance to 5% NaCI in Lowenstein-Jensen media, and non-utilisation of citrate as a sole carbon source are characteristics that distinguish M. abscessus from M. chelonae.', 'role': 'assistant'}]