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: Radiology
For a full mouth examination, how many IOPAs are required for a child aged 8-9 years? 
Select and explain. 
A. 10, B. 12, C. 8, D. 14
B: 12
Answer: B: 12 
Explanation: Mixed Dentition (7 to 12 Years): A complete examination of the mixed dentition, if indicated, consists of two incisor periapical views, four canine periapical views, four posterior periapical views and two to four posterior bitewing views.
Note: For 8-9 years of age, 12 film survey is recommended (Principles and practice of Pedodontics by Arathi Rao). So, 12 will be better answer.