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': 'All the following are true of Tuberculosis except -a) For sputum to be positive,bacilli should be > 104/ mlb) Niacin test differentiates M. tuberculosis and M. bovisc) Pathogenicity to rabbits differentiates M. tuberculosis and M. bovisd) Culture techniques have low sensitivity \nSelect and explain. \nA. ab, B. bc, C. cd, D. ac', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]