This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral and Visceral Vascular Imaging, Subject name: Radiology
Investigation of choice for DVT is- 
Select and explain. 
A. Doppler USG, B. Angiography, C. CT scan, D. MRI
A: Doppler USG
Answer: A: Doppler USG 
Explanation: Ans. is 'a' i.e., Doppler USG o Doppler USG is the first investigation of choice for DVT.