This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development of GU system and Neuro-vascular supply of pelvis & perineum, Subject name: Anatomy
[{'content': 'The nerve mediating pain of External hemorrhoids is: \nSelect and explain. \nA. Hypogastric nerve, B. Inferior rectal nerve, C. Pelvic splanchnic nerve, D. Sympathetic plexus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: -External hemorrhoids --> present below pectinate line , painful bleeding is present --> pain carried by Inferior Rectal Nerve (branch of pudendal nerve). -Internal haemorrhoids --> present above pectinate line --> painless bleeding is its feature.', 'role': 'assistant'}]