Final answer:
True, unconscious persons are placed in the supine position for mouth care to prevent aspiration. The supine position means lying on their back, facing upwards, allowing fluids to drain outwards safely.
Step-by-step explanation:
The statement that unconscious persons should be placed in the supine position for mouth care is true. When providing mouth care to an individual who is unconscious, it is vital for their safety to position them properly to prevent aspiration. A person lying in the supine position is on their back with their face pointing upwards.
This orientation allows any fluids in the mouth to drain outwards and not into the throat or respiratory tract, where they could cause choking or aspiration pneumonia. Therefore, when administering mouth care to an unconscious patient, the supine position is most appropriate. It allows for easier access to the mouth and is safer for the patient.