This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Radiological anatomy, Subject name: Radiology
The arrow is located in which of the following structures? 
Select and explain. 
A. Left costophrenic angle, B. Left cardiophrenic angle, C. Right costophrenic angle, D. Right cardiophrenic angle
C: Right costophrenic angle
Answer: C: Right costophrenic angle 
Explanation: None