<prompt> Engaging diameter in vertex, with complete extension is:SuboccipitobregmaticMentoverticalSubmentobregmaticOccipitofrontal  <response>: Ans. is c i.e., Submentobregmatic DiametersMeasurement in cm inchesAttitude of the headPresentation1. Suboccipito-bregmatic-extends from the nape of the neck to the center of the bregma9?5 cm 3 34 Complete flexionVertex2. Suboccipito-frontal- extends from the nape of the neck to the anterior end of the anterior fontanelle or centre of the sinciput10 cm 4Incomplete flexionVertex3. Occipito-frontal - extends from the occipital eminence to the root of the nose Glabella.11?5 cm 4 12 Marked deflexionVertex4. Mento-vertical - extends from the mid point of the chin to the highest point on the sagittal suture14 cm 5 12 Partial extensionBrow5. Sybmento-vertical - extends from junction of floor of the mouth and neck to the highest point on the sagittal suture11?5 cm 4 12 Incomplete extensionFace6. Submento-bregmatic - extends from junction of floor of the mouth and neck to the centre of the bregma9-5 cm 3 34 Complete extensionFace 