The typical lesion of primary syphilis is
A. gummas in bones, in nervous tissues, or on the skin.
B. the development of buboes in the lymph nodes at the site of infection.
C. purulent sore throat.
D. a painless reddened lesion called a chancre at the site of infection.
E. a generalized rash.
Answer: D. a painless reddened lesion called a chancre at the site of infection.
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