The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 17-year-old football player with no significant past medical history, social history, or family history presents to his pediatrician with itching in his groin. He says this started during summer workouts leading up to this season. He denies having any rash anywhere else on his body. The blood pressure is 123/78 mm Hg, pulse is 67/min, respiratory rate is 15/min, and temperature is 38.1°C (98.7°F). Physical examination reveals an erythematous, well-demarcated patch with peripheral scale on the left thigh, pubic region, and perineum. There is no apparent scrotal involvement with the rash. How can you confirm the suspected diagnosis?   (A) KOH examination of lesion scrapings   (B) Nikolsky's sign on physical exam   (C) Gram stain of skin scrapings   (D) AFB stain of skin scrapings
['(A) KOH examination of lesion scrapings <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', "(A) KOH examination of lesion scrapings \n (B) Nikolsky's sign on physical exam \n (C) Gram stain of skin scrapings \n (D) AFB stain of skin scrapings <> possible answers", '  A 17-year-old football player with no significant past medical history, social history, or family history presents to his pediatrician with itching in his groin. He says this started during summer workouts leading up to this season. He denies having any rash anywhere else on his body. The blood pressure is 123/78 mm Hg, pulse is 67/min, respiratory rate is 15/min, and temperature is 38.1°C (98.7°F). Physical examination reveals an erythematous, well-demarcated patch with peripheral scale on the left thigh, pubic region, and perineum. There is no apparent scrotal involvement with the rash. How can you confirm the suspected diagnosis? <> context@']