In my circumstances, I have absolutely no problem with lying in response to the questionnaire. I have been diving for 35 years now. I am physically fit and have no health issues worth discussing. Within the last two years, I have been checked out by an MD who specializes in dive medicine, discussed my history with him, had various tests by him (and other doctors), discussed my medications with him, and he has cleared me for diving.
There is no law that requires that the questions be asked or that I answer the questions. It's nothing more than self-imposed officiousness designed to protect the dive op from being sued. It's none of the dive op's business what my medical history is other than the dive op wants to protect his back. So I give the dive op the protection he wants by answering NO to each and every question. If it turns out that I have a medical condition that causes a problem, that's not the dive op's problem. Beyond that, the dive op has no legitimate interest in my medical history, and I am not going to share it with him.
I go through the questionnaire, mark each question NO, sign it, and hand it in.