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: Surgery
Orthodontic treatment in management of cleft lip and palate is usually carried out in: 
Select and explain. 
A. Deciduous dentition and mixed dentition, B. Mixed dentition, C. Mixed and permanent dentition, D. Permanent dentition
C: Mixed and permanent dentition
Answer: C: Mixed and permanent dentition 
Explanation: Many children with cleft lip and palate require orthodontic treatment. Orthodontic treatment is commonly carried out in two phases:

Mixed dentition (8 - 10 years) – to expand the maxillary arches as a prelude to alveolar bone graft.
Permanent dentition (14 -18 years) – to align the dentition and provide a normal functioning occlusion. This phase of treatment may also include surgical correction of a malpositioned/ retrusive maxilla by maxillary osteotomy.