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: Radiology
[{'content': 'Echoencephalography is most useful in detecting: \nSelect and explain. \nA. Ventricular dilatation, B. Midline shift, C. Epilepsy, D. Vascular lesions', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Ventricular dilatation', 'role': 'assistant'}]