"which healthcare professional is typically a secondary care provider?

a-nurse practitioner

b-physician

c-dermatologist

d-physician’s assistant"

The healthcare professional who is typically a secondary care provider is C. a dermatologist.
Primary care providers are those whom you go to first - so, you first see the doctor (physician) and his assistant/nurse, who then refer you to a specialist - a physician is usually a GP, which means that here the only specialist is a dermatologist who specializes in skin problems.

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