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
A-alpha ﬁbers have a speed of conduction of  ------ m/s. 
Select and explain. 
A. 20-Oct, B. 40-50, C. 50-70, D. 70-120
D: 70-120
Answer: D: 70-120 
Explanation: None