Which activity can substantially increase a person’s risk of contracting HIV infection? A. having sex with a condom with an uninfected partner
B. getting a massage from an infected person
C. having unprotected sex with an infected person
D. having dinner with a group of infected people

C

Explanation: Always have protected sex, you can catch aids or end up getting pregnant, if you are planning to have unprotected sex then have the person check if they have hiv as well as you, you are responsible as much as the other person and if you do go the hospital as soon as possible and ask to get tested.

answer; genes dictate the production of specific enzymes, and affected individuals have genetic defects that cause them to lack certain enzymes;