In the internal ear, the membranous labyrinth is filled with:
1. cerebrospinal fluid
2. plasma
3. endolymph
4. perilymph

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Match the following columns and select the correct option
| Column I | Column II | ||
| (a) | The organ of Corti | (i) | Connects the middle ear and pharynx |
| (b) | Cochlea | (ii) | Coiled part of the labyrinth |
| (c) | Eustachian tube | (iii) | Attached to the oval window |
| (d) | Stapes | (iv) | Located on the basilar membrane |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (iv) | (ii) |
| 2. | (iv) | (ii) | (i) | (iii) |
| 3. | (i) | (ii) | (iv) | (iii) |
| 4. | (ii) | (iii) | (i) | (iv) |