This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
Exercise is also prescribed as an adjuvant treatment of depression. Most probably it acts by: 
Select and explain. 
A. Increasing pulse pressure, B. Improving hemodynamics, C. Raising endorphin levels, D. Inducing good sleep
C: Raising endorphin levels
Answer: C: Raising endorphin levels 
Explanation: Ans. (c) Raising endorphin levels(Ref: Guyton, 13th ed/p.1086)Exercise can help relieve symptoms of depression by raising endorphin levels