Frostbite with tissue necrosis of left ear and superficial frostbite to right fingers. Patient was out snowmobiling when he ran out of gas and had to wait hours to be rescued. Initial encounter

Sciatica is a term used to describe:

A. the inflammation of the sciatic nerve. B. generalized low back pain. C. the stretching of the sciatic nerve. D. chronic back pain.

Unpasteurized milk from an infected cow is an example of a(n) ____ factor in the transmission of disease. 

A. susceptibility B. immunity C. endogenous D. reservoir E. environmental