Exactly, I treat it like I'm a defense attorney and I'm preparing them for the cross.
This has nothing to do with being truthful, it's just not being stupid:
I used to do something similar when I used to sell. I'd tell the client to treat it like an IRS audit, i.e. have all of your information handy, tell the truth, but NEVER offer more info than what they ask.
Had an older client (early 70's) one time who was in perfect health -- and proud of it -- applying for long-term care insurance. During his phone interview, just as it was about to wrap up, he told them, beaming with pride and without being asked, that he even had a sigmoidoscopy done a couple of years before -- at his own request -- and it came out perfect. Well...the ins company then wanted the results of that test, which was done sort of informally at Johns Hopkins and not by his regular doc, and it took several weeks to find (he was retired military). In the meantime, the client got all upset that the underwriting was taking so long...thought maybe they found something wrong. Taught me a good lesson.