What Makes It Risky to Rely on the Presence of Chitin

What makes it risky to rely on the presence of chitin in adult amphibian skin as the sole positive test for the presence of chytrids?

A) Other mycoses may be in progress in the same amphibian simultaneously.
B) The amphibian may harbor arthropod ectoparasites simultaneously.
C) Bacterial infections may be simultaneously underway in the amphibian.
D) Three of the responses above are correct.
E) Two of the responses above are correct.