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
Moist heat kills of the following except- 
Select and explain. 
A. Brucella, B. Mycobacteria, C. Salmonella, D. Coxiella burnetti
D: Coxiella burnetti
Answer: D: Coxiella burnetti 
Explanation: Ans. is 'd' i.e., Coxiella Burnetti . Heat sterlization is done either by dry heat or by moist heat. . Pasteurisation is a type of sterilization by moist heat. . Pasteurisation is done by two methods. a) Holder method 63degC for 30 minutes b) Flash method 72degC for 15-20 seconds . All nonsporing pathogens such as mycobacteria, brucella and salmonellae are destroyed. Coxiella burnetii is relatively heat resistant and may survive the holder method. Note : The best answer of this question would have been none of the above, as pasteurization is not the only method of moist heat sterilization. Autoclaving is also a type of moist heat sterilization, and it kills all the microorganisms.