The correct answer is (c), brain.
An electroencephalogram (EEG) is a test that measures the electrical activity of the brain. It is used to diagnose and monitor a variety of conditions, including epilepsy, sleep disorders, and brain tumors.
The EEG is performed by placing small electrodes on the scalp. The electrodes are connected to a machine that records the electrical activity of the brain. The recording is called an EEG waveform.
The EEG waveform can be used to identify abnormal electrical activity in the brain. This information can be used to diagnose and monitor a variety of conditions.
The EEG is a safe and painless test. It is often used in conjunction with other tests, such as magnetic resonance imaging (MRI) and computed tomography (CT) scans, to provide a more complete picture of the brain.
The EEG is a valuable tool for diagnosing and monitoring a variety of conditions. It is a safe and painless test that can be used to identify abnormal electrical activity in the brain.
The other options are incorrect because they are not the organs that the EEG is used to record the working of.
(a) The heart is an organ that pumps blood throughout the body. It is not the organ that the EEG is used to record the working of.
(b) The lungs are organs that take in oxygen and release carbon dioxide. They are not the organs that the EEG is used to record the working of.
(d) The kidneys are organs that filter waste products from the blood. They are not the organs that the EEG is used to record the working of.