You should upgrade or use an alternative browser. Can the contacted being lie in Contact Other Plane in 5th edition?
http://www.dnd-spells.com/spell/contact-other-plane-ritual
Case for lying:
Case for truthiness:
How would you run Contact Other Plane in your games?
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I think this could strictly be up to the DM's digression. Personally I could see how contacting other planes (pretty much any time you talk to a fiend) would make thematic sense in the contacted being lying, either from mistrust or a grudge.

How would you run Contact Other Plane in your games?
I'd give truthful answers. The old chance for lying appears to have been superseded in 5e by the chance that casting the spell will drive the caster insane.

They can doubt it if they wish; they know the wording of the spell and the answer yo've given Experience will tell them over the course of the campaign how the spell works.

The only question is why you would want to, aside from being able to laugh at a player's costly mistake. And I get enough of that in 5 minutes of normal play.
Sounds like we are going to go with it being generally truth based. Sometimes it might be wrong due to the being not having all or accurate info, but generally now directly lying.
Thanks for the opinions!
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