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': 'The following pathogen does not satisfy "Koch\'s postulates" - \nSelect and explain. \nA. Bacillus anthracis, B. Mycobacterium tuberculosis, C. Clostridium tetani, D. Lepra bacilli', 'role': 'user'}, {'content': "Answer: D \nExplanation: Koch postulates\n\nRobert Koch proposed a series of postulates that have been applied broadly to link many specific bacterial species with a particular disease.\nKoch's postulates are :\n\n\nThe microorganism should be found in all cases of the disease in question and its distribution in the body should be in accordance with the lesions observed.\nThe microorganism should be grown in pure culture in vitro (or outside the body of the host) for several generations.\nWhen such a pure culture is inoculated into susceptible animal species, the typical disease must result.\nThe microorganism must again be isolated from the lesions of such experimentally produced disease.", 'role': 'assistant'}]