This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nuclear Medicine, Subject name: Radiology
Definition of nuclear medicine includes which of the following? 
Select and explain. 
A. Field of medicine helpful for radiotherapeutic management of all., B. Field of medicine, which provides both physiological, & structrual information in non-quantifiable form., C. Field of medicine helpful for location & extent of cancer but with many hazards., D. Field of medicine which depends on accretion, transit & disappearance of radioactive tracer in specific regions of body & useful in management of cancer.
D: Field of medicine which depends on accretion, transit & disappearance of radioactive tracer in specific regions of body & useful in management of cancer.
Answer: D: Field of medicine which depends on accretion, transit & disappearance of radioactive tracer in specific regions of body & useful in management of cancer. 
Explanation: Ans. d (Field of medicine which depends on accretion, transit & disappearance of radioactive tracer in specific regions of body & useful in management of cancer). (Ref. Modem Trends in Radiotherapy by Deeley, 216)# Nuclear medicine is the field of medicine which depends on accretion, transit & disappearance of radioactive tracer in specific regions of body & hence useful in management of cancer.# It provides both physiological and structural information in a quantifiable form.# It is helpful for location and extent of cancer without much hazards & discomfort to patient.