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

### Instruction:
What is the lowest Year, when Lok Sabha is "4th Lok Sabha"?

### Inputs:
table_name: table, columns: ['Year', 'Lok Sabha', 'Members of Parliament', 'Party Won', "Winner's % votes", 'Trailing Party', 'Trailing Party % votes']

### Response:
SELECT MIN Year FROM table WHERE Lok Sabha = 4th lok sabha