Advertisement: Seventy-five percent of dermatologists surveyed prefer Dermactin to all other brands of skin cream. Why? We consulted dermatologists during the development of Dermactin to ensure that you have the best skin cream on the market. So if you need a skin cream, use Dermactin. The reasoning in the advertisement is questionable because the advertisement ['presumes, without providing justification, that some dermatologists are less qualified than others to evaluate skin cream', 'fails to state the number of dermatologists surveyed, which leaves open the possibility that the sample of doctors is too small to be reliable', 'overlooks the possibility that for a few people, using no skin cream is preferable to using even the best skin cream', 'overlooks the possibility that other types of doctors have cause to use Dermactin, which would render the sample unrepresentative']