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Match the following columns.
\begin{tabular}{llll}
\hline & \multicolumn{1}{c}{ Column I (Cancer causing agents) } & Column II (Examples) \\
\hline A. & Chemical agent & 1. Benzopyrene in cigarette smoke \\
\hline B. & Physical agent & 2. X-rays \\
\hline C. & Biological agent & 3. Oncogenic viruses \\
\hline
\end{tabular}
Codes
\( \begin{array}{llll} & \mathrm{A} & \mathrm{B} & \mathrm{C} \\ \text { (a) } & 1 & 2 & 3 \\ \text { (c) } & 3 & 1 & 2\end{array} \)
\( \begin{array}{llll} & \text { A } & \text { B } & \text { C } \\ \text { (b) } & 3 & 2 & 1 \\ \text { (d) } & 1 & 3 & 2\end{array} \)
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