The correct answer is letter B.
Explanation: All the others were eliminated because they were not right.
The correct answer is serotonin.
Serotonin is a neurotransmitter (NT) produced in the human body. It is known as the "happiness" or "feel good" chemical. Many mood altering drugs and illicit substances like hallucinogens, antidepressants and stimulants interact with serotonin in the brain, which in turn alters people's moods, making them feel good and happy while consuming these substances.
Do you mean, what is the name for them?
If they don't have any passport, they are called "stateless"
if they don't respect any government over them, they can be called "anarchist"
