Opioids are drugs, which bind to specific opioid receptors present in our :

Both (a) and (b)

a-central nervous system

b-gastrointestinal tract

c-Both (a) and (b)

d-urinogenital system

Opioids are drugs that bind to specific opioid receptors, which are primarily found in the central nervous system (CNS), including the brain and spinal cord. These receptors are responsible for mediating the effects of opioids, such as pain relief, sedation, and euphoria. By binding to these receptors, opioids can modulate the transmission of pain signals and produce analgesic effects.

While opioids primarily act on the CNS, they can also have effects on other parts of the body, including the gastrointestinal tract. Opioid receptors in the gastrointestinal tract contribute to the side effects of opioids, such as constipation and reduced gastrointestinal motility.

Therefore, the correct answer is (c) Both (a) and (b), as opioids can bind to opioid receptors in both the central nervous system and the gastrointestinal tract.