<prompt> Flexible sigmoidoscope is ...cm length:30 cm40 cm60 cm70 cm  <response>: Ans. c 60cmRef: Bailey 26th Edition, Page 1217The image from Bailey demonstrates all the scope lengths: Proctoscope: 8cm Per rectal examination: 12cm Sigmoidoscope Rigid: 18cm Sigmoidoscope Flexible: 60cm Colonoscope: 160cm 