<prompt> Which muscle is irritated by inflamed retrocaecal appendix -Psoas majorGluteus maximusQuadratus femorisObturator internus  <response>: Ans. is a i.e., Psoas major Abdominal pain in appendicitis: In children with abdominal pain, who hold their right hip in a flexed position to obtain relief from the pain, one should suspect retrocaecal appendicitis causing irritation of the psoas muscle. 