This is the back of my calf and i’m wondering if that is a stretch mark .. if it is, why do i have it?

Which of these is a fact about performance enhancing drugs? a. steroids lack addictive properties. b. steroids use can cause dangerous side effects. c. it is safe to use steroids when working out. d. a person can get in legal trouble for using steroids.

This is a negative reaction to food that doesn’t involve the immune system

First to answer will be the brainliest i need the answer asap