This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Morphology and Physiology of Bacteria, Subject name: Microbiology
Koch's postulate is fullfilled by all except - 
Select and explain. 
A. M.tuburculosis, B. E.coli, C. T. pallidum, D. None
C: T. pallidum
Answer: C: T. pallidum 
Explanation: Ans. is 'c' i.e., T. pallidum Koch postulateso Robert Koch proposed a series of postulates that have been applied broadly to link many specific bacterial species with particular disease,o Koch's postulates are :1 The 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.2. The microorganism should be grown in pure culture in vitro (or outside the body of the host) for several generations.3.When such a pure culture is inoculated into susceptible animal species, the typical disease must result.4. The microorganism must again be isolated from the lesions of such experimentally produced disease,o Microorganisms that do not meet the criteria of Koch's postulateso Microorganism that partially satisfy the postulates# E, coli induced diarrhea