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

### Instruction:
Who was the heir when the monarch was Wareru?

### Inputs:
table_name: table, columns: ['Monarch', 'Heir', 'Status', 'Relationship to Monarch', 'Became heir; reason', 'Ceased to be heir; reason', 'Next in succession']

### Response:
SELECT Heir FROM table WHERE Monarch = Wareru