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

### Instruction:
Who was the pregame host before 1992 when there was a play by play of Bob Irving?

### Inputs:
table_name: table, columns: ['Year', 'Network', 'Play-by-play', 'Colour commentator(s)', 'Pregame host']

### Response:
SELECT Pregame host FROM table WHERE Year < 1992 AND Play-by-play = bob irving