Match the following columns and select the correct option.
| Structure | Description |
|---|---|
| (a) Placenta | (i) Androgens |
| (b) Zona pellucida | (ii) Human chorionic gonadotropin (hCG) |
| (c) Bulbo-urethral glands | (iii) Layer of the ovum |
| (d) Leydig cells | (iv) Lubrication of the penis |