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
Conformation radiotherapy uses: 
Select and explain. 
A. Multileaf collimator, B. Single leaf collimator, C. Cone, D. Cylinder
A: Multileaf collimator
Answer: A: Multileaf collimator 
Explanation: Ans. Multileaf collimator