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

### Instruction:
What is the birth date of the member with the Defining characteristic of pink hair?

### Inputs:
table_name: table, columns: ['Name', 'Real Name', 'Birthdate', 'Costume Role', 'Defining characteristics']

### Response:
SELECT Birthdate FROM table WHERE Defining characteristics = pink hair