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

### Instruction:
Which League Cup has a FA Cup of 5, and a Club of boston united, and a League smaller than 16?

### Inputs:
table_name: table, columns: ['Player', 'Club', 'League', 'FA Cup', 'FA Trophy', 'League Cup', 'Total']

### Response:
SELECT MAX League Cup FROM table WHERE FA Cup = 5 AND Club = boston united AND League < 16