Which one reveals, more appropriately, functioning of the heart? A. Electrocardiogram B. Echocardiogram C. Stethoscope D. Lipid profile

An echocardiogram (ultrasound of the heart) shows the heart chambers, valves and pumping action in real time, so it best reveals how the heart is functioning. An ECG records only its electrical activity, a stethoscope just its sounds, and a lipid profile is a blood test for cholesterol.