<prompt> What is the most likely cause of this finding in a man from Mexico who had a biopsy showing gram-negative bacilli?Klebsiella rhinoscleromatisMycobacterium lepraeAcinetobacter baumanniiTreponema pallidum  <response>: Answer A. Klebsiella rhinoscleromatisRhinoscleroma is a chronic bacterial infection that is typically caused by the gram-negative bacillus K. rhinoscleromatis. 