The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Candida is injected into the skin of a 38-year-old female patient. Forty-eight hours later, there is a 14 mm raised, slightly hardened area at the injection site. What type of hypersensitivity reaction has occurred and what cell type plays a role?   (A) Type I hypersensitivty; eosinophils   (B) Type IV hypersensitivity; mast cells   (C) Type III hypersensitivity; CD4+ T cells   (D) Type IV hypersensitivity; CD4+ T cells
['(D) Type IV hypersensitivity; CD4+ T cells <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Type I hypersensitivty; eosinophils \n (B) Type IV hypersensitivity; mast cells \n (C) Type III hypersensitivity; CD4+ T cells \n (D) Type IV hypersensitivity; CD4+ T cells <> possible answers', '  Candida is injected into the skin of a 38-year-old female patient. Forty-eight hours later, there is a 14 mm raised, slightly hardened area at the injection site. What type of hypersensitivity reaction has occurred and what cell type plays a role? <> context@']