This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': "There are millions of cases of leprosy (Hansen's disease) worldwide, but predominately in Asia and Africa. The clinical spectrum of Hansen's disease is best characterized by \nSelect and explain. \nA. Immunologic anergy, B. Chronic pneumonitis, C. Peripheral neuritis, D. Bacilli in lesions that digest tissues", 'role': 'user'}, {'content': "Answer: C \nExplanation: Leprosy (Hansen's disease) affects primarily skin, peripheral nerves, and mucous membranes. The disease ranges from tuberculoid leprosy, which is characterized by few lesions containing small numbers of acid-fast mycobacteria, to lepromatous leprosy, which is characterized by multiple lesions containing many microorganisms. Chronic pulmonary infection is more characteristic of infection with Mycobacterium tuberculosis than M. leprae.", 'role': 'assistant'}]