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': 'Preferred Investigation for diagnosing Acute Appendicitis in children? \nSelect and explain. \nA. USG, B. CECT, C. MRI, D. X - Ray', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Graded compression Ultrasonography is the preferred initial imaging modality in the evaluation of Acute Appendicitis in children.', 'role': 'assistant'}]