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: Medicine
Ideal imaging modality for Renal arterial hypertension - 
Select and explain. 
A. IVP, B. USG, C. Angiography, D. Renin assay
C: Angiography
Answer: C: Angiography 
Explanation: None