MCQ
Active immunity may be acquired by
- ANatural infection
- BVaccines
- CToxoids
- ✓All of these
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Match the following columns and select the correct option
| Column $I$ | Column $II$ |
| ($a$) Ovary | ($i$) Human chorionic Gonadotropin |
| ($b$) Placenta | ($ii$) Estrogen and Progesterone |
| ($c$) Corpus Iuteum | ($iii$) Androgens |
| ($d$)Leydig cells | ($iv$)Progesterone only |
