$\begin{array}{1 1} \text{a. Morphine, cocaine and heroin} \\ \text{b. Morphine, codeine,LSD and pethidine} \\ \text{c. Morphine, codeine, heroin, pethidine and methadone} \\ \text{d. Morphine, codeine, heroin and mescaline.} \end{array}$
