The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 19-year-old Caucasian male presents to your office with hypopigmented skin. He undergoes a skin biopsy and is found to have an absence of melanocytes in the epidermis. Which of the following is the most likely diagnosis?   (A) Tinea versicolor   (B) Albinism   (C) Vitiligo   (D) Melanoma
['(C) Vitiligo <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Tinea versicolor \n (B) Albinism \n (C) Vitiligo \n (D) Melanoma <> possible answers', '  A 19-year-old Caucasian male presents to your office with hypopigmented skin. He undergoes a skin biopsy and is found to have an absence of melanocytes in the epidermis. Which of the following is the most likely diagnosis? <> context@']