Identify a, b, c, d, e, and f in the table given below:
\[
\begin{array}{|c|c|c|c|}
\hline
\textbf{Sl. No.} & \textbf{Organism} & \textbf{Bioactive Molecule} & \textbf{Use} \\
\hline
1 & \textit{Monascus purpureus} & a & b \\
\hline
2 & c & d & \text{Antibiotic} \\
\hline
3 & e & \text{Cyclosporin A} & f \\
\hline
\end{array}
\]