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: Dental
[{'content': "Moro's reflex is initiated by: \nSelect and explain. \nA. The sudden movement of the neck., B. Sudden noise., C. Both., D. None.", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]