This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals In Radiology, Subject name: Radiology
[{'content': 'Alpha particle is similar to \nSelect and explain. \nA. Electron, B. Proton, C. Neutron, D. Helium nucleus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: d (Helium nucleus) Ref: Vasudevan 4th ed/p 464.Alpha particle consists of 2 protons and 2 neutrons bound together into a particle identical to Helium nucleus He2+.Beta particles are high energy, high speed electrons or positrons emitted by radioactive nuclei. Gamma rays are electromagnetic radiation of high frequency.X-rays are low energy photons.Penetration powen-Gamma ray > X ray. Beta particle > alpha particleIonising and damaging power: -Alpha particle> Beta particle > X ray> Gamma ray', 'role': 'assistant'}]