This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Down’s 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? 
Select and explain. 
A. Go-Me, B. Go-Gn, C. Tangent to the lower most border of the mandible, D. Me-antegonial notch
A: Go-Me
Answer: A: Go-Me 
Explanation: 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.
Bimler’s line- line joining menton to antegonial notch.

Ref: Radiographic cephalometry:Jacobson A