B) A radionuclide is part of a radiopharmaceutical, which functions as a tracer.
Explanation:
The relationship between a radiopharmaceutical, tracers and radionuclides is that, radionuclide is part of a radiopharmaceutical, which functions as a tracer.
A radiopharmaceutical is a radioactive substance administered for medical purposes.
A radionuclide is an isotope of a substance that has radioactive capabilities.
A tracer is used to study biological processes.
Radiopharmaceuticals are radioactive substances that are harmless to the body.
They are used to understand how the body functions.
