**Core Concept**
Hippocrates is widely regarded as the "Father of Medicine" due to his significant contributions to the field, including the development of the Hippocratic Oath, which is still taken by physicians today. He is credited with laying the foundations of clinical observation, patient care, and medical ethics.

**Why the Correct Answer is Right**
Hippocrates is considered the father of medicine due to his emphasis on clinical observation, patient care, and medical ethics. He believed in the importance of patient confidentiality, which is reflected in the Hippocratic Oath. His teachings and writings, which were compiled in the Hippocratic Corpus, are still studied by medical students today.

**Why Each Wrong Option is Incorrect**
**Option A:** Galen is a prominent figure in the history of medicine, but he is not considered the father of medicine. He made significant contributions to anatomy, physiology, and pharmacology, but his work built upon the foundations laid by Hippocrates.

**Option B:** Andreas Vesalius is known as the "Father of Modern Anatomy" due to his detailed descriptions of the human body. However, he is not considered the father of medicine as a whole.

**Option C:** William Harvey is credited with the discovery of the circulatory system, but he is not considered the father of medicine. His work built upon the foundations laid by earlier physicians, including Hippocrates.

**Clinical Pearl / High-Yield Fact**
The Hippocratic Oath is still taken by physicians today, and it emphasizes the importance of patient confidentiality, non-maleficence (do no harm), and beneficence (do good).

**Correct Answer:** C. Galen