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 12-year-old boy presented to the orthodontic clinic with irregularity of his front teeth. Intraoral examination reveals class I molar relationship and crowding of maxillary and mandibular teeth. Orthodontic diagnosis is: 
Select and explain. 
A. Class I type 1, B. Class I type 2, C. Class I type 3, D. Class I type 4
A: Class I type 1
Answer: A: Class I type 1 
Explanation: Dewey divided Angle’s class I into 5 types and Angle's class III into 3 types.