user: Question: What is the IUNC of district of Cayo and reserve of Actun Tunichil Muknal?
Columns: ['Reserve', 'District', 'IUCN', 'Co-management', 'Est.', 'Description']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Actun Tunichil Muknal', 'Cayo', 'Ia', 'Belize Audubon Society ; Institute of Archaeology', 2004.0, 'Terrestrial.']
SQL:

assistant: SELECT "IUCN" FROM "Table" WHERE "District" = 'Cayo' AND "Reserve" = 'Actun Tunichil Muknal';