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': 'TRUE about mycobacterium other than tuberculosis? \nSelect and explain. \nA. Causes disseminated infection, B. Occurs in persons with normal immunity, C. Causes decreased efficacy of BCG due to cross immunity, D. Person to person transmission is seen', 'role': 'user'}, {'content': "Answer: C \nExplanation: Mycobacterium other than mammalian tubercle bacilli which cause human disease is called atypical, anonymous, unclassified, environmental, oppounistic. They have also been called para tubercle, tuberculoid, MOTT. They are of 4 groups: photochromogens, scotochromogens, non photochromogens, rapid growers. Widely distributed in the environment and are paicularly abundant in wet soil, marshland, streams, rivers and estuaries. Human beings are therefore regularly exposed to mycobacteria as a result of drinking, washing, showering and inhalation of natural aerosols. Ref: Ananthanarayanan & paniker's textbook of microbiology Ed 8th Page 359.", 'role': 'assistant'}]