Choose the incorrect pair.
\[
\begin{array}{|c|l|l|}
\hline
\text{Element} & & \text{Role} \\
\hline
\text{A} & \text{Zinc} & \text{Auxin synthesis} \\
\hline
\text{B} & \text{Nickel} & \text{Activator of urease} \\
\hline
\text{C} & \text{Molybdenum} & \text{Component of nitrogenase} \\
\hline
\text{D} & \text{Manganese} & \text{Activator of catalase} \\
\hline
\end{array}
\]