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
In serial extraction procedure if maxillary 1st premolar is extracted then maxillary canine erupts in direction 
Select and explain. 
A. Downward, B. Downward-backward, C. Downward-forward, D. Forward
B: Downward-backward
Answer: B: Downward-backward 
Explanation: None