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: Social & Preventive Medicine
Unit of one of radiation absorbed is – 
Select and explain. 
A. Grey, B. Roengten, C. Curie, D. Bequerrel
A: Grey
Answer: A: Grey 
Explanation: Units of potency

Roentgen and coulomb per kilograme → Units of exposure. It is the amount to which a person is exposed.
Red and Gray  → Units of absorbed dose. It is the amount which is absorbed per gram of tissue.
Rem and Sievert  → Product of the absorbed dose and the modifying factor. Represent the degree of potention danger to health.