This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
A dense renogram is obtained by – 
Select and explain. 
A. Dehydrating the patient, B. Increasing the dose of contrast media, C. Rapid (Bolus) injection of dye, D. Using non–ionic media
C: Rapid (Bolus) injection of dye
Answer: C: Rapid (Bolus) injection of dye 
Explanation: Rapid injection of dye is the preferred method for obtaining dense nephrogram.