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Match the media component (Column I) with its role (Column II).

$$\begin{array} {ll} \textbf{Column I} & \textbf{Column I}  \\  \text{P. Sucrose} & \text{1. Anti-foam agent} \\ \text{Q. Zinc chloride} & \text{2. Nitrogen source} \\  \text{R. Ammonium sulphate} & \text{3. Carbon source} \\  \text{S. Silicone oil} & \text{4. Trace element} \end{array}$$

  1. $\text{P-1, Q-2, R-3, S-4}$
  2. $\text{P-2, Q-1, R-3, S-4}$
  3. $\text{P-3, Q-2, R-4, S-1}$
  4. $\text{P-3, Q-4, R-2, S-1}$
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