This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Quality and Management in Radiotherapy, Subject name: Radiology
Mega voltage therapy consists of: 
Select and explain. 
A. Greater than 1000 k volts, B. 500-1000, C. Less than 500, D. More than 2000
A: Greater than 1000 k volts
Answer: A: Greater than 1000 k volts 
Explanation: Ans: A (Greater than 1000 k volts) Ref: Internet sourceExplanation:Megavoltage X-rays are produced by linear acceleratorsOperates at voltages in excess of 1000 kV (1 MV) range, and therefore have an energy in the MeV rangeBeams w ith the voltage range of 4-25 MV are used to treat patients because they penetrate w ell to deep sites within the body.