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: Biochemistry
Maximum damage to DNA is caused by: 
Select and explain. 
A. a-rays, B. 13-rays, C. 7-rays, D. 8-rays and UV rays
A: a-rays
Answer: A: a-rays 
Explanation: A i.e. a-raysMaximum damage to DNA is caused by a- RaysQ. RadiationContentPenetrating Power Poorest-Q (1)Ionizing PowerMaximumQDamaging PowerMost damagingu-paicleHelium nuclei (i.e. 2 protons & 2neutrons)b-paicleEither high energy electron orantimatter counter pa positronGreater than a-paicle (100)Lesser than a-paicle< a-paicleX-RayLow energy photonsQMore than [l-paiclesLesser than 13-paicle<13-paicley-radiationVery high energy photonsQMore than X Rays (10000)i.e. Most PenetratineMinimum IonizineLeast damaging