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

### Instruction:
If the constellation is Gemini, what is the spectral type?

### Inputs:
table_name: table, columns: ['HD designation', 'Constellation', 'Distance ( ly )', 'Spectral type', 'Signal power ( kW )', 'Date sent', 'Arrival date']

### Response:
SELECT Spectral type FROM table WHERE Constellation = Gemini