<prompt> In brow presentation, presenting diameter isare :SubmentoveicalOccipitofrontalMentoveicalSuboccipitobregmatic  <response>: Ans. is c i.e. Mentoveical Brow Presentation : Causes of brow presentation are same as for face presentation. Most common cause -- Flat pelvis. Engaging diameter -- Mentoveical 14cm. There is no mechanism of labour. Diagnosed on PV by palpating supra orbital ridges and anterior fontanelle. Delivery is by cesarean section. 