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
Best investigation for pericardial effusion is: 
Select and explain. 
A. Cardiac catheterization, B. USG, C. Echocardiography, D. Lateral view X-ray chest
C: Echocardiography
Answer: C: Echocardiography 
Explanation: Ans. Echocardiography