Decubitus ulcers are caused by
A. Pressure on a bony projection for a prolonged period of time cuts off the blood supply to an area of skin and an ulcer forms.
B. An allergenic agent that irritates the skin and the decubitus ulcer is formed.
C. An infestation of the skin with mites that itch; the scratching causes ulcers.
D. A tumor that starts in the lower layers of the skin and opens up to the surface causing a decubitus ulcer.
E. A caustic chemical such as an acid that gets on the skin and causes the ulcer.
Answer: A
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