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 bitewing X-ray angulation of cone should be: 
Select and explain. 
A. 10° above horizontal, B. 15° below horizontal, C. 10° below horizontal, D. 15° above horizontal
A: 10° above horizontal
Answer: A: 10° above horizontal 
Explanation: None