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: Gynaecology & Obstetrics
[{'content': 'The internal pudendal artery supplies which of the following \nSelect and explain. \nA. Proximal vagina, B. Distal vaginal walls, C. Posterior vaginal wall, D. Bladder trigone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Proximal vagina\xa0→\xa0\n\nCervical branch of uterine artery\nVaginal artery\n\nPosterior vaginal wall\xa0→ Middle rectal artery\nDistal vaginal wall\xa0→ Internal pudendal artery.', 'role': 'assistant'}]