Definition: You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.
Input: I prefer the dermatologist's treatments for acne rather than the over-the-counter treatments, because the _ work slow.

over-the-counter treatments