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

### Instruction:
What's the nationality of Henry Carr having a time of 20.3y?

### Inputs:
table_name: table, columns: ['Time', 'Athlete', 'Nationality', 'Location of race', 'Date']

### Response:
SELECT Nationality FROM table WHERE Athlete = henry carr AND Time = 20.3y