Final answer:
The prototype drug of the strong opioid agonist is Morphine. It serves as a standard for comparing other opioids and is known for its effective pain-relieving properties, but with a high potential for abuse and addiction. Therefore, the correct option is C.
Step-by-step explanation:
The prototype drug of the strong opioid agonist is c) Morphine. When referring to opioids, morphine is often considered the standard against which other opioids are measured due to its effectiveness in pain relief. Morphine, codeine, and other opioid drugs are either derived from the opium poppy or synthesized to mimic natural opiates. They bind to opioid receptors in the body, reducing pain and producing euphoria, but also have a high potential for abuse and addiction. Prescription opioids, which include drugs like oxycodone and fentanyl, as well as heroin, which is illegal, are used medically for pain relief but have serious risks associated with their use.