Jason was a healthy college student who was playing a game of football with his friends, he got tackled by the competing linebacker and hit his head on the ground and passed out. He woke up later in the hospital where the doctor told him that his heart rhythm was irregular and he had to be fed through a tube because his digestion system no longer normal. Which part of his brain was injured severely enough to cause these symptoms?

A. Medulla oblangata

B. Cerebellum

C. Basil ganglia

D. Hypothalamus