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During medical examination a cadet in the naval college was detected to have a painless dense ulcer 1.5x0.5 in size in his perianal area at the 2 o'clock position. The ulcer floor resembles ''old fat''. What is the provisional diagnosis?a.Rectal fistulab.Hard syphilitic chancre of the rectumc.Anal crypt suppurationd.Anal cancere.Rectal fissure
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