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
Four film survey (series) for children consists of maxillary and mandibular occlusals along with: 
Select and explain. 
A. Two maxillary posterior periapicals, B. Two mandibular posterior periapicals, C. Two posterior bitewings, D. One panoramic and one lateral jaw views
C: Two posterior bitewings
Answer: C: Two posterior bitewings 
Explanation: 4 film survey requires 2 anterior occlusal and 2 bitewing radiographs.
8 film survey requires 4 posterior, 2 anterior occlusal and 2 bitewing radiographs.
12 film survey requires 4 IOPAs for posterior teeth, 4 canine IOPAs, 2 incisor IOPAs and 2 bitewing radiographs.
16 film survey requires 4 permanent molar radiographs additional to the 12 film survey.

Ref: Principles and practice of Pedodontics by Arathi Rao