Cardiology is the study of which organ?

Cardiology is specifically focused on the study of the heart. This medical specialty encompasses a wide range of topics, including the diagnosis and treatment of heart diseases, the physiology of the heart, and the management of overall cardiovascular health. Understanding cardiology is vital for effectively addressing issues such as heart attacks, arrhythmias, heart failure, and other cardiovascular conditions. Each of the other options — lungs, kidneys, and brain — corresponds to different medical specialties: pulmonology for the lungs, nephrology for the kidneys, and neurology for the brain. Therefore, cardiology's exclusive association with the heart is what makes it distinct within the broader field of medicine.