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
Who proposed the classification of primary dentition based on distal surface of second molar? 
Select and explain. 
A. Angle, B. Baume, C. Simon, D. Dewey
B: Baume
Answer: B: Baume 
Explanation: Classification of Primary Dentition given by Baume, 1959