What is a possible consequence of abusing intravenous drugs such as heroin?

a. alcohol poisoning
b. blood-borne diseases
c. lung cancer
d. improved physical fitness

I believe the answer is: B.Blood-borne diseases

The heroine itself cannot cause blood borne disease because in order for it to happen, the blood of other people need to make a contact with your blood. The Needle that is used among heroine addicts on the other hand, could cause the blood contact that resulted in blood borne diseases.

9, 5, 10000000 ( that is supposed to be a ten for the last one)