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

### Instruction:
What is the IUNC of district of Cayo and reserve of Actun Tunichil Muknal?

### Inputs:
table_name: table, columns: ['Reserve', 'District', 'IUCN', 'Co-management', 'Est.', 'Description']

### Response:
SELECT IUCN FROM table WHERE District = cayo AND Reserve = actun tunichil muknal