A 35-year-old man from rural India presents with chronic cough, low-grade fever, and weight loss for 3 months. Chest X-ray shows hilar lymphadenopathy with upper lobe infiltrates. Sputum smear microscopy is positive for acid-fast bacilli. Histopathology of a lung biopsy reveals caseating granulomas. What is the most common cause of granulomatous inflammation in India?

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