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: Unknown
[{'content': 'Endoscopic sinus surgery prerequisite- \nSelect and explain. \nA. MRI of paraanasal sinus, B. CT of PNS, C. Mucocilliary clearing testing, D. Acoustic tests', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Refer: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 220 – 221)\n\nEndoscopic surgery of inflammatory diseases of paransal sinuses (sinusitis or polyp) requires a very detailed preoperative knowledge of the individual anatomical conditions and pathological changes\nCT scan are used best to visualize sinus areas\nCT scan provides excellent definition of paranasal sinuses and is a prerequisite for endoscopic surgery\n\n“CT scan limited study coronal cuts in bone window is prerequisite for endscopic sinus surgery”-----Mohan Bansal', 'role': 'assistant'}]