The study of the heart and its action and diseases.

• A. Hematology
• B. Neurology
• C. Cardiology
• D. Dermatology

Answer: (C)

The main idea here is the study of the heart and how it functions, along with the diseases that affect it. The term cardiology comes from cardio-, meaning heart, and -logy, meaning study. So cardiology is the field that covers the heart’s anatomy, its electrical and mechanical actions, and conditions that disrupt its function, such as arrhythmias, heart attacks, and heart failure, along with the tests and treatments used to manage them.

Hematology focuses on blood, neurology on the nervous system, and dermatology on the skin, so they don’t describe the heart and its diseases.