Answer the following question given this paragraph: 

Anemia is a disease that occurs when there is not enough hemoglobin (or iron) in the blood so it can’t carry adequate oxygen to the cells. There are many possible causes of anemia. One possible cause is excessive blood loss due to an injury or surgery. Not getting enough iron in the diet is another possible cause.


Q: Which disease occurs when there is not enough hemoglobin in the blood?

 Choices:

- Pulmonary

- Respiratory

- Diabetes

- anemia

A:
anemia
