Correct answer is (c) 5000 mrem
Best explanation: A person working in the radiology department is in constant contact with the radioactive devices which are giving out radiations. Since radioactivity is harmful to the body a threshold is set beyond which a person should not be exposed to radiations. For a person involved in radiology, the limit is of 5000 mrem provided they take all the precautions, like wearing a lead jacket etc.