A 43-year-old woman has had increasing difficulty swallowing over the past year. She notices that her hands turn white
and are painful on exposure to cold. She remarks, “I may be getting older, but at least I don't have any wrinkles on my face
or hands yet.” On physical examination, her temperature is 37°C, pulse is 68/min, respirations are 14/min, and blood
pressure is 115/75 mm Hg. The skin of her face and hands appears taut and shiny. A punch biopsy specimen of the skin
of the hand shows dermal collagenous fibrosis and focal calcification. She receives yearly esophageal dilation for the next
20 years, during which time she develops no serious illnesses. Which of the following serologic test results is most likely to
be positive?
(A) Anticentromere antibody(B) Anti–DNA topoisomerase antibody(C) Antigliadin antibody(D) Antimicrosomal antibody
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