Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the average Isolation in the municipality of Sunndal at an elevation of more than 1850?

### Inputs:
table_name: table, columns: ['Peak', 'Elevation (m)', 'Prominence (m)', 'Isolation (km)', 'Municipality', 'County']

### Response:
SELECT AVG Isolation (km) FROM table WHERE Municipality = sunndal AND Elevation (m) > 1850