Which of the following best describes pet scans? a)pet scans are the only method doctors use to perform mammograms. b)pet scans can be used to perform simple surgical procedures. c)pet scans give information about the structure and function of tissues. d)pet scans only provide information about joints and bone structure.

The best answer is C. 

PET Scans also called Positron Emission Tomography, is a radiological image diagnostic tool, used to to take a a CT scan which shows the uptake of sugar in the body. Radioactive sugar is usually injected into a person, which is then absorbed by the bodys cells. This test is usually used to rule out malignacies (cancers) or fungal diseases like Coccidiodimycosis (valley fever), usually this pathologies present with abnormal areas of high uptake of sugars, and is usually used to rule out if a nodule or mass is benign or malignant. 

1. the answer is a parasite