In the early 1800s, was the medical doctor's most reliable and effective medicine that was used for a variety of conditions, but mainly for pain relief.

Opium was the medical doctor's most reliable and effective medicine that was used for a variety of conditions, especially for pain relief. It really blocked all of the cells that travel through the body to make us a feel pain. The opium was a good drug of choice to dull that pain. Nowadays, doctor's no longer use this method of treatment.

Ithink the answer is d.