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': 'M. avium intracellulare is: September 2009 \nSelect and explain. \nA. Non photochromogens, B. Scotochromogens, C. Photochromogens, D. Rapid growers', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Non photochromogens Runyon Groups * Pigmentation studies - Scotochromogens: Pigmentation in the dark (and light) - Photochromogens: Pigmentation only after exposure to light - Non-photochromogens: No pigment forms Group I: photochromogens - Mycobacterium kansasii - Mycobacterium marinum Group II: scotochromogens - Mycobacterium scrofulaceium - Mycobacterium gordonae Group III: non-photochromogens - Mycobacterium avium complex Group IV: Rapid growers - Mycobacterium fouitum - Mycobacterium chelonei', 'role': 'assistant'}]