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
Spherical theory of articulator was given by: 
Select and explain. 
A. R.E. Hall, B. Monsoon, C. WGA Bonwill, D. House
B: Monsoon
Answer: B: Monsoon 
Explanation: None