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The causative agent of syphilis is:

  • A. Borrelia burgdorferi
  • B. Treponema pallidum
  • C. Leptospira interrogans
  • D. Rickettsia rickettsii
Correct Answer: B

Rationale: The correct answer is B: Treponema pallidum.
1. Treponema pallidum is a spirochete bacterium known to cause syphilis.
2. Borrelia burgdorferi causes Lyme disease, not syphilis.
3. Leptospira interrogans causes leptospirosis, not syphilis.
4. Rickettsia rickettsii causes Rocky Mountain spotted fever, not syphilis.
Therefore, Treponema pallidum is the causative agent of syphilis, making it the correct answer.