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: Dental
Which is true for Type B Autoclave? 
Select and explain. 
A. Which has vacuum cycle for drying, B. Which has gravity displacement for drying, C. Which has unsaturated chemical vapour for sterilization, D. Which use dry heat as a sterilization source
A: Which has vacuum cycle for drying
Answer: A: Which has vacuum cycle for drying 
Explanation: None