A 72-Year-Old Woman Was Suspected of Having a Tumor of the Sigmoid

A 72-year-old woman was suspected of having a tumor of the sigmoid colon. The physician decided to confirm the diagnosis by performing a sigmoidoscopy.
-The following anatomic statements are correct concerning the procedure of sigmoidoscopy except which?

A) After inserting the instrument into the anus, the lighted end enters the ampulla of the rectum after a distance of about $1.5 \mathrm{in} .(4 \mathrm{~cm})$ .
B) Some side-to-side movement may be necessary to avoid the transverse rectal folds.
C) The rectosigmoid junction will be reached approximately $6.5 \mathrm{in}$ . $(16.25 \mathrm{~cm})$ from the anal margin.
D) To negotiate the rectosigmoid junction, the tip of the sigmoidoscope should be directed anteriorly and to the patient's left.
E) Stretching of the colonic wall may give rise to colicky pain in the upper part of the abdomen in the region of the xiphoid process.