Wei has allergy symptoms. he has gone to his regular doctor and an allergy specialist, but he wasn't given a prescription by either doctor. instead, he was advised to buy any over-the-counter medicine. while he was in the specialist's waiting area, he read a magazine where he saw three ads for an allergy medicine called sneezeless. a week later, in a drug store, wei says to his brother, 'my doctor says sneezeless works great. i'll buy that one.' wei and his doctor never discussed sneezeless. wei has fallen victim to which of the following errors?