I believe the answer is A
The drug connects receptors that are only connected during sex, eating your favorite food, excising, etc. Therefore releasing <span>Endorphins. This makes you feel really good. Soon your brain will run out of </span><span>Endorphins since the drug makes it release them all at once making you need the drug to function (addiction).</span>
Stress can lead to hair loss, obesity, heart attacks, and it affects your mental state of mind.