This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'Innervation of lower one third of vaginal is ? \nSelect and explain. \nA. Pudendal nerve, B. Pelvic splanchnic nerve, C. Lumbar splanchnic nerve, D. Hypogastric nerve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The lower one-third of the vagina is pain sensitive and is supplied by the pudendal nerve through the inferior rectal and posterior labial branches of the perineal nerve. The upper two-thirds of the vagina are pain insensitive and are supplied by sympathetic L7, L2 and parasympathetic segments 52 to 54. Nerves are derived from the inferior hypogastric and uterovaginal plexuses. Sympathetic nerves are vasoconstrictor and parasympathetic nerves vasodilator. The fibres which accompany the vaginal aeries form the vaginal nerves. ref - BDC 6e vol2 pg394', 'role': 'assistant'}]