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
Consistent radiographs require: 
Select and explain. 
A. Long cone technique, B. Fixed kvp & mA, C. Automatic processing, D. Proper developing
B: Fixed kvp & mA
Answer: B: Fixed kvp & mA 
Explanation: None