Final answer:
The operating room should have two entrances. This design helps maintain a sterile environment, controls the flow of personnel and equipment, and aids in infection prevention.
Step-by-step explanation:
An operating room, also known as an operating theatre, is a facility within a hospital where surgical procedures are carried out. The number of entrances to an operating room is designed to maintain a sterile environment, control the flow of personnel and equipment, and aid in the prevention of infection. According to guidelines and hospital design principles, the correct answer is B) Two entrances. One is typically used as a "clean" entrance for staff, and patients, whereas the other is used as a "dirty" exit for removing waste and used surgical equipment after procedures. This facilitates a unidirectional flow that can help to minimize the potential for contamination.