When you ask a question, and someone gives you an answer, you will often get the urge to accept the answer, note it, and move on. Resist this urge. Resist it because the more professional or high-stakes the situation, the less likely the person answering your question will give you the whole truth at the outset. It’s not always that people are trying to hide things, more often it’s because they are answering off-the-cuff; they haven’t thought through an answer. They haven’t been asked for all of the information, or had it made clear what is important.