This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Necrotizing granulomatous inguinal lymphadenopathy is caused by \nSelect and explain. \nA. Syphilis, B. Granuloma inguinale, C. Sarcoidosis, D. Tuberculosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary syphilis - the regional lymph nodes are swollen, discrete, non-tender and rubbery. Ref: Baveja textbook of microbiology; 4th edition.', 'role': 'assistant'}]