What is the most likely cause of this finding in a man from Mexico who had a biopsy showing gram-negative bacilli?: (A) Klebsiella rhinoscleromatis, (B) Mycobacterium leprae, (C) Acinetobacter baumannii, (D) Treponema pallidum
Answer is A. Answer A. Klebsiella rhinoscleromatisRhinoscleroma is a chronic bacterial infection that is typically caused by the gram-negative bacillus K. rhinoscleromatis.