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': 'Startle and Grasp Palmar reflex is initiated by: \nSelect and explain. \nA. The sudden movement of the neck., B. Sudden noise or loud sound., C. Both., D. None.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]