What is this method of interrogating prisoners called?

The landlord asked about the prisoner's dilemma, which is a typical example of economics, not the content of law.

Prisoner's Dilemma is about two people in AB who commit the same crime, and are arrested and interrogated respectively. If A tells the truth and B doesn't, A will be acquitted and B will be sentenced to five years. On the contrary, B is acquitted and A will be sentenced to five years' imprisonment; If both of them tell the truth, they will be sentenced to two years in prison; If both of them don't talk, they will be sentenced to 1 year.

This is a choice of strictly dominant strategy.