This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
Thermatomyces is used in? 
Select and explain. 
A. Sterilization standardization, B. Gram staining, C. Selective media preparation, D. Antibiotic sensitivity
A: Sterilization standardization
Answer: A: Sterilization standardization 
Explanation: Ans. a (Sterilization standardization). (Ref. Ananthnarayan, Microbiology, 4th ed., 26, 29)# For determining the efficiency of moist-heat sterilization = Spores of bacillus stearothermophilus.# For determining the efficiency of dry-heat sterilization = Spores of non-toxigenic strains of C.tetani.