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
To record the angulation of the maxilla, a plane should be formed with minimum: 
Select and explain. 
A. 2 posterior and 1 anterior reference points, B. 3 posterior and 1 anterior reference points, C. 1 posterior and 3 anterior reference points, D. 1 posterior and 2 posterior reference points
A: 2 posterior and 1 anterior reference points
Answer: A: 2 posterior and 1 anterior reference points 
Explanation: To record the angulation of the maxilla, a plane should be formed with at least two posterior references and one anterior reference.