This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
[{'content': 'Which muscle is irritated by retrocecal appendicitis? \nSelect and explain. \nA. Psoas, B. Obturator, C. Gluteus maximus, D. Quadratus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) PsoasRef: Bailey and Love 27th edition, Page 1303On hyperextension of hip by putting psoas muscle into action -- retrocecal appendicitis pain is exhibited.', 'role': 'assistant'}]