For the most part yes... when people ask questions like this, it's usually b/c they did leave something out and would be omission like the others above have stated. However, there are instances where the omission is not a lie (just in my opinion) if the omission does not effect the outcome. If I went and did several things with friends over the weekend and another friend asks me what I did over the weekend... I can simply say "Some friends and I hung out over the weekend." I ommitted alot of stuff that I did... but it doesn't affect the outcome.