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

### Instruction:
What was the Stage when Pascal Richard had the Mountains classification and Vladimir Poulnikov won?

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

### Response:
SELECT Stage FROM table WHERE Mountains classification = pascal richard AND Winner = vladimir poulnikov