Answer:

Explanation:
Sorry If it is wrong......
Anemia because it decreases blood viscosity
This is very very easy its oubvously A.you are pain free
1. Get at least 6-8 hours of sleep.
2. Exercise at least 30 minutes a day.
3. Eat stress relieving foods.
Hope that helps!
I think it is housed in the Medulla Oblongata