It's probably a test of the effectiveness of a particular ad. In essence the exercise is to see if a particular commercial has saturated its' potential target audience. The pollster gives a vague question identifying the product and giving only a slight lead beyond that. If the respondents give the information on the target ad, the commercial is a success. If the respondents give info on a similar commercial, the overall ad campaign is somewhat successful. If the respondents do not know at all, the ad campaign is not working.
I'm not in marketing, so this is just a guess.
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