The correct option is B CNS and GIT
Drugs with receptors on CNS and GIT
Opioids like morphine and its derivatives like heroin bind to opioid receptors in the central nervous system and gastrointestinal tract. These drugs suppress brain function, slowing down body functions, relieve intense pain and produce temporary euphoria.
Drugs with receptors in the brain
Cannabinoids have receptors in the brain and affect the cardiovascular system. These drugs are hallucinogens and increase the heart beat.
Correct option (a).