A 12-year-old has been taking an antibiotic for a respiratory infection. His mother called 911 because she believes her child has gotten worse despite the antibiotics. He is alert and oriented, and tells you that he does not have any difficulty breathing. He has a raised rash on his chest, arms, and back. His respiratory rate is 18, pulse is 92, and blood pressure is 108/72. You should suspect:

A) an overdose of the antibiotic.
B) a generalized respiratory infection.
C) a mild allergic reaction to the antibiotic.
D) anaphylactic shock.

C