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: Physiology
[{'content': 'Not a component of Brain stem \nSelect and explain. \nA. Mid brain, B. Pons, C. Medulla, D. Spinal cord', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Brainstem\n1. Medulla:responsible for regulating and/ or coordination of:\n- Blood pressure.\n- Breathing.\n- Swallowing.\n- Coughing.\n- Vomiting.\n2. Pons : participates in respiratory regulation and the relay of information from cerebral hemispheres to the cerebellum.\n3. Midbrain : participates in coordination of visual and auditory systems.', 'role': 'assistant'}]