This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Radiology
Most impoant investigation for pericardial effusion - 
Select and explain. 
A. Cardiac catheterization, B. USG, C. Echocardiography, D. X-ray chest
C: Echocardiography
Answer: C: Echocardiography 
Explanation: 2D Echocardiography is the investigation of choice for Pericardial Effusion ,Cardiac Tamponade ,Valvular Hea ds , Cardiomyopathy