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
The length of tongue spike in tongue thrusting habit breaking appliance should be upto the 
Select and explain. 
A. Incisal edges of maxillary incisors, B. Incisal edges of mandibular incisors, C. Cingulum of mandibular incisors, D. Cervical margin of mandibular incisors
C: Cingulum of mandibular incisors
Answer: C: Cingulum of mandibular incisors 
Explanation: None