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
True statement regarding nitrates in myocardial perfusion study:- 
Select and explain. 
A. Stress agent, B. Decreased myocardial flow in ischemia, C. Enhances the detection of myocardial bility in Thallium 201 radiopharmaceutical agent, D. Reduced collateral flow into ischemic zone
C: Enhances the detection of myocardial bility in Thallium 201 radiopharmaceutical agent
Answer: C: Enhances the detection of myocardial bility in Thallium 201 radiopharmaceutical agent 
Explanation: Nitrates in myocardial perfusion study Enhances the detection of myocardial bility in Thallium 201 radiopharmaceutical agent Causes increased myocardial flow in ischemia Increases collateral flow into ischemic zone Stress agents used in myocardial perfusion study Dobutamine Adenosine To study Myocardial bility 18-FDG PET (best agent) Nitrate augmented Thallium 201 Scintigraphy Dynamic contrast enhanced MRI