Yes but .......you are all assuming that the patient would respond according to instructions. The reason for my query is that I totally failed to realise the significance of the question so I just found it irritating and offputting and I felt they were pushing their job onto me, which was ridiculous and it certainly undermined my confidence in the doctor. I am sure I am not alone in my reaction
Also, if you were a non-smoker, actual or passive, and had had a bad cough for sometime and were convinced you had lung cancer, if the doctor said to you, after you had described your symptoms, what you thought you had, would you admit you were convinced you had cancer when the chances of you having it are so small? I do not think I would.