Answer:
The correct answer choice for the question: The study, or care, of patients with conditions of the heart and circulatory system, would be, D: cardiology.
Step-by-step explanation:
The name of the medical field that studies and treats patients with conditions that affect their heart and cardiovascular system, is cardiovascular medicine. However, the medical specialists who work on taking care of this major body system are known as cardiologists, and the specialty from internal medicine is known as cardiology. Cardiology is precisely the specialty that focuses only on the heart and cardiovascular system, over any other system.