This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'Cutaneous vasoconstriction is mediated by \nSelect and explain. \nA. Sympathetic adrenergic nerves, B. Sympathetic cholinergic nerves, C. Parasympathetic cholinergics, D. Somatic nerves', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sympathetic noradrenergic division constricts the blood vessels of the skin(which limits bleeding from wounds). Ref: Ganong&;s review of medical physiology; 23rd edition; pg: 268.', 'role': 'assistant'}]