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': 'Time sector scanning of neonates is preferred because of the following reason most practical reason: \nSelect and explain. \nA. Open fontanelles, B. Inexpensive, C. Children more co-operative, D. Better resolution', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Open fontanelles', 'role': 'assistant'}]