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
An exaggerated smile line seen in OPG is due to 
Select and explain. 
A. Patient's chin positioned too high, B. Patient's head positioned too far back, C. Patient's chin positioned too low, D. Patient's head positioned too forward
C: Patient's chin positioned too low
Answer: C: Patient's chin positioned too low 
Explanation: None