Match the commercial microbial sources in Group I with the products in Group II.
| Group I | Group II |
| P. Corynebacterium lilium | 1. 2, 3-Butane di-ol |
| Q. Klebsiella oxytoca | 2. Poly-β-hydroxybutyric acid |
| R. Aspergillus niger | 3. Glutamic acid |
| S. Alcaligenes eutrophus | 4. Citric acid |
A. P-3, Q-1, R-2, S-4
B. P-3, Q-1, R-4, S-2
C. P-1, Q-3, R-2, S-4
D. P-1, Q-3, R-4, S-2
Answer: Option B

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