This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
[{'content': 'Which of the following is used as a control during sterilization of ionizing radiations \nSelect and explain. \nA. Bacillus stearothermophilus, B. Bacillus anthracis, C. Bacillus subtilis, D. Bacillus pumilus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bacillus stearothermophilus - Moist heat ( Autoclave ), Bacillus anthracis causes anthraxBacillus subtilis - Dry heat ( Hot air oven)', 'role': 'assistant'}]