Can you please quickly help me?

Question

Question: What is biomarker?

A.) A biological therapy for a disease

B.) A measurable characteristic by which presence or severity of a disease can be indicated

C.) A symptom of a disease

D.) A naturally occurring characteristic by which a particular disease can be identified

I belive answer is B but I am not sure.

Answer 1

B seems like a reasonable choice, but so does D, I believe. If I could only choose one, it would be (B).