You can get a sexually transmitted infection by sharing 1) needles 2) toothbrushes 3) drinks 4) gum

The correct answer is 1) needles

Explanation:

Sexually transmitted disease or infection is the disease that usually spread by sexual contact but it can also be spread during blood transfusion, using blade or needles infected with the blood of a person infected with STD.

Virus, bacteria, protozoans can be the cause of sexually transmitted disease. Sexually transmitted infection caused by bacteria and protozoans are curable but of virus is non-curable. Most teenagers and adults get STIs when they share common needle during drug abuse.

So by sharing needles, you can get a sexually transmitted disease.