Match the structures with their functions in Cnidaria:
| List I | List II |
|---|---|
| A. Cnidoblast --- I. Used for anchorage, defence and for the capture of prey B. Polyps --- IV. Produce Medusae asexually C. Medusae --- II. Used to form the polyps sexually D. Hypostome --- III. Single opening for gastrovascular cavity | I. Used for anchorage, defence and for the capture of prey IV. Produce Medusae asexually II. Used to form the polyps sexually III. Single opening for gastrovascular cavity |