<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 19-year-old man and recent immigrant from Brazil present to the clinic. He has no known past medical, past surgical, or family history. The patient admits to having several regular sexual partners. Today, he complains of a skin rash on his back. He is unclear when it started but became aware when one of his partners pointed it out. A review of systems is otherwise negative. Physical examination reveals numerous hypopigmented skin lesions over his upper back. When questioned, he states that they do not get darker after spending time in the sun. On examination, there is a 5 cm 1.9 in patch of hypopigmented skin in the center of his back with a fine-scale overlying it. What is the most likely diagnosis?? A: Tinea versicolor, B: Mycosis fungoides, C: Pityriasis rosea, D: Vitiligo, E: Secondary syphilis,  <response>: This is a clinical vignette about a 19-year-old Brazilian man with multiple sexual partners who presents with asymptomatic hypopigmented skin lesions on his back that do not darken with sun exposure. He has no significant past medical history. The key findings are asymptomatic hypopigmented skin lesions in a sexually active young adult that do not tan. Based on the description, the most likely diagnosis is tinea versicolor, a common superficial fungal infection caused by Malassezia that leads to hypopigmented macules and patches that do not tan. Pityriasis rosea presents as a herald patch followed by smaller lesions on the trunk in a christmas tree pattern, which is not described here. Mycosis fungoides, vitiligo and secondary syphilis are less likely in this clinical scenario.A: Tinea versicolor 