Which of the following patients is at greatest risk if another patient who is highly contagious comes into the office? 

A. Diabetic patient
B. Young adult with asthma
C. Immunocompromised patient
D. Patient with high blood pressure
E. Woman who is 5 months pregnant

C. Immunocompromised patient
The immune system of an immunocompromised patient is not functioning at a normal level, so this patient is at greater risk than the average person for becoming sick.