ECG is used to assess the function of:

Correct option is D

Ans. (d) Heart
Sol. An Electrocardiogram (ECG or EKG) measures the electrical activity of the heart and is used to detect heart rate, rhythm, and abnormalities such as arrhythmias or myocardial infarction.
Explanation of each option:
· (a) Brain – Assessed using EEG (electroencephalogram), not ECG.
· (b) Kidney – Assessed by renal function tests like serum creatinine and urea.
· (c) Liver – Assessed via liver function tests (LFTs), not ECG.
· (d) Heart – Correct. ECG specifically monitors cardiac electrical activity.