<prompt> Largest diameter of pelvis:TransverseTrue conjugateObliqueBituberous  <response>: Ans. a TransverseRef.: D.C. Dutta 8th ed. 99-104 If such questions are asked regardless of pelvic plain, then transverse diameter of pelvic inlet has largest diameter 13cm.If it is not in option, next best option is oblique diameter 12cm Smallest diameter regardless of pelvic plain- Bispinous 10cm For more details, please refer to above explanation. 