Which histological feature is the hallmark of a 'Ghon focus' in primary tuberculosis?
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Correct answer: Caseating granuloma with Langhans giant cells
A Ghon focus is a subpleural area of granulomatous inflammation. It is characterized by central caseous (cheese-like) necrosis surrounded by epithelioid macrophages, lymphocytes, and multinucleated Langhans giant cells.
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