This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Best diagnostic modality for parotid swelling is - \nSelect and explain. \nA. Enucleation, B. FNAC, C. Superficial parotidectomy, D. Excisional biopsy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Best diagnostic modality → FNAC\nBest imaging investigation → MRI (MRI is the most sensitive study to determine soft-tissue extension and involvement of adjacent structures but it lacks the specificity for differentiating benign from malignant neoplasms.)', 'role': 'assistant'}]