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

### Instruction:
Who had the fastest lap of the race that Ayrton Senna won on 23 April?

### Inputs:
table_name: table, columns: ['Grand Prix', 'Date', 'Location', 'Pole Position', 'Fastest Lap', 'Winning Driver', 'Constructor', 'Report']

### Response:
SELECT Fastest Lap FROM table WHERE Winning Driver = ayrton senna AND Date = 23 april