Why Is Hippocrates Often Called the Father of Western Medicine

Why is Hippocrates often called the father of Western Medicine?

A) He believed that disease was caused by physical and environmental factors that could be studied.
B) He developed "medications" from plant and animal sources to treat certain diseases.
C) He created a medical school using a model that resembles modern medical schools.
D) His students swore an oath called the Hippocratic Oath, which is still recited by graduating physicians.