You are answering a USMLE-style medical question. Question: A 23-year-old woman comes to the physician because she is embarrassed about the appearance of her nails. She has no history of serious illness and takes no medications. She appears well. A photograph of the nails is shown. Which of the following additional findings is most likely in this patient? Options: A) Silvery plaques on extensor surfaces B) Flesh-colored papules in the lumbosacral region C) Erosions of the dental enamel D) Holosystolic murmur at the left lower sternal border Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.