This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ULTRASOUND, Subject name: Radiology
[{'content': 'Transcranial USG is done using which of the following probe \nSelect and explain. \nA. linear, B. Curvilinear, C. Sectoral, D. Endocavitary', 'role': 'user'}, {'content': 'Answer: C \nExplanation: *Sectoral/phase arrayed probe has a smaller footprint and is used in Chest USG,Echo,and Transcranial USG. TVS', 'role': 'assistant'}]