This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Pathology
[{'content': 'A 11-year-old boy came with history of cough for 15 days. On examination he was found to have cervical lymphadenopathy. The lymph node biopsy is shown below. Which of the following is the most appropriate diagnosis? \nSelect and explain. \nA. Tuberculosis, B. Leprosy, C. Sarcoidosis, D. Syphilis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cavitation occurs only in secondary tuberculosis. Both primary and secondary tuberculosis are characterized bycaseating granulomas, often with Langhans giant cells, which heal by scarring and calcification. The skin test result for tuberculin sensitivity is positive in both forms.', 'role': 'assistant'}]