Family history is the top risk factor for a person to get an Alzheimer's disease. This is because of heredity that a person cannot escape from. So it is important that a person must know the family history whether he or she can be a dominant carrier of this disease or not.
What statement? Can't answer without it
Answer: B: Contact between infected saliva and an open wound.
Explanation: It gets in your blood stream. For example, sharing needles.
