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: Unknown
Which among the following has maximum ionizing power 
Select and explain. 
A. Neutron, B. Proton, C. X-rays, D. Alpha rays
D: Alpha rays
Answer: D: Alpha rays 
Explanation: Ans: d (Alpha rays) Ref: Park, 19th ed, p. Harrison, 16th ed, p. 483Alpha rays is having maximum ionizing power among the above options.Most ionizing radiation - alpha raysMaximum penetrating power -beta rays (alpha < beta < gamma)Maximum scattering electrons - H+ ionsRadiation effectsPhotoelectric effect -Low energy (30-100 KeV)diagnostic radiologyCompton effect -high energy -therapeutic radiologyPair production -higher (>1.02 MeV)