Match the two columns: column-I & column-II:
| A. C4b2a | 1. Pentamer |
| B. IgM | 2. ELISA |
| C. B cell maturation | 3.C3 convertase |
| D. Horse radish peroxidase | 4. Active immunization |
| E. Vaccine | 5. Stromal cell |
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