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

### Instruction:
what is the birth date when the weight (kg) is 100 and the world rank is 2?

### Inputs:
table_name: table, columns: ['Nation', 'Birth date', 'Height (m)', 'Weight (kg)', 'World Rank']

### Response:
SELECT Birth date FROM table WHERE Weight (kg) = 100 AND World Rank = 2