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 which is not a contraindication 
Select and explain. 
A. Impaction of canine, B. Lingual tipping of incisors, C. Ditching, D. Open bite
B: Lingual tipping of incisors
Answer: B: Lingual tipping of incisors 
Explanation: None