Answer the following question given this paragraph: 

Hemophilia is the name of a group of hereditary diseases that affect the body's ability to control blood clotting. Hemophilia is caused by a lack of clotting factors in the blood. Clotting factors are normally released by platelets. Since people with hemophilia cannot produce clots, any cut can put a person at risk of bleeding to death. The risk of internal bleeding is also increased in hemophilia, especially into muscles and joints. This disease affected the royal families of Europe.


Q: What is the name of a group of hereditary diseases that affect the body's ability to control blood clotting?

 Choices:

- arithmya

- anemia

- hypertension

- hemophilia

A:
hemophilia
