Select one answer: Hippocrates Herophilus Erasistrat Alexander Democritus

The correct answer is Hippocrates. He was an ancient Greek physician who is often referred to as the "Father of Medicine." Hippocrates is known for his contributions to the field of medicine, including the Hippocratic Oath, which is still used today as an ethical guideline for physicians. He is also known for his theory of the four humors, which was a widely accepted medical theory in ancient Greece.