> He answered correctly, I was unable to do so, but we were both allowed to enter without further investigation. It's like that cliché often employed in coding

> He answered correctly, I was unable to do so, but we were both allowed to enter without further investigation. It's like that cliché often employed in coding interviews, but immigration officers are more serious about it: They don't need a correct answer, they are interested primarily in observing your answering process.