This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'Epithelial granuloma is caused by - \nSelect and explain. \nA. Neutrophil, B. Cytotoxic T cells, C. Helper T cells, D. NK cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Granuloma formation is a type IV hypersensitivity reaction mediated by helper T cells. This reaction is similar to caseating granuloma formation in TB Basic Pathology, Robbins. Page no.: 56', 'role': 'assistant'}]