This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Large Intestine, Rectum, and Anal canal, Subject name: Anatomy
[{'content': 'Commonest position of appendix? \nSelect and explain. \nA. Subhepatic, B. Pelvic, C. Pre-ileal, D. Retrocaecal', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d (Retrocaecal) (Ref. Bailey and Love surgery 25th/pg. Fig. 67.1; pg. 1204)Vermiform appendix is a muscular, tubular structure arising from caecum.Its various positions include:# Retrocaecal74%# Pelvic21%# Paraceacal2%# Sub-caecal1.5%# Preileal1%# Postileal0.5%Note: the appendicular artery is branch of lower division of Iliocolic artery.', 'role': 'assistant'}]