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

### Instruction:
Which stage has a mountains classification of Mariano Piccoli and was won by Giuseppe Citterio?

### Inputs:
table_name: table, columns: ['Stage', 'Winner', 'General classification', 'Points classification', 'Mountains classification', 'Trofeo Fast Team']

### Response:
SELECT Stage FROM table WHERE Mountains classification = mariano piccoli AND Winner = giuseppe citterio