Return to Answer

Charm/Dominate Person

You could simply command the target to truthfully answer any and all questions you ask, and they will be forced to comply.

Charm/Dominate Person/Monster

You could simply command the target to truthfully answer any and all questions you ask, and they will be forced to comply.

Be advised, these spells work only on humanoids, the more powerful variants charm monster and dominate monster will be necessary for more exotic targets.

The canonical answer is going to be zone of truth:

Ring of Truth Telling

There is also the truth serum which replicated the zone of truth spell:

With some careful questioning, we can get the job done with zone of truth:

Charm/Dominate Person

The spells charm person and dominate person can assist in getting a target to tell you the truth, though they do not techincally detect if a particular statement is true.

Charm person makes the target regard you as a friendly acquaintance, which may make them more likely to tell you some things - anything they would divulge to a friendly acqaintance.

Dominate person has a much stronger effect:

While the target is charmed, you have a telepathic link with it as long as the two of you are on the same plane of existence. You can use this telepathic link to issue commands to the creature while you are conscious (no action required), which it does its best to obey. You can specify a simple and general course of action, such as "Attack that creature," "Run over there," or "Fetch that object." If the creature completes the order and doesn't receive further direction from you, it defends and preserves itself to the best of its ability.

You could simply command the target to truthfully answer any and all questions you ask, and they will be forced to comply.

Ring of Truth Telling

There is also the truth serum which replicates the zone of truth spell:

This method requires you to kill a humanoid to learn information, so will often not be a great method. But it works in a pinch.

This method requires you to kill a humanoid to learn information, so will often not be a great method. But it works in a pinch, and in the pinchiest of pinches you could resurrect the target with magic.