Unfortunately, it's not always that easy. We may have all the best intentions of telling the truth, but sometimes, in our desire to impress people, we lie.
Nobody likes a complainer.
I asked a client that question some time ago. He said what everyone expected him to say, only I knew differently. Due to a work related injury, he had been off work for about six weeks. He returned to work, and had been doing his job for several months when I asked him that question. I got the same answer.