<prompt> Downs cephalometric analysis of a patient reveals a high mandibular plane angle. Which of the following landmarks are used for the construction of the mandibular plane in this analysis?Go-MeGo-GnTangent to the lower most border of the mandibleMe-antegonial notch  <response>: Tweed and Ricketts- straight line tangent to the lower most border of the mandible.Downs- line joining Gonion to menton.Steiner- line joining Gonion to gnathion.Bimlers line- line joining menton to antegonial notch.Ref: Radiographic cephalometry:Jacobson A 