<s>[INST] Given an abstract text, please determine whether it contains any drug mentions. Provide a 'Yes' or 'No' answer based on the presence or absence of drugs. Abstract Text: The Efficacy Of Pre-Procedural N-Acetylcysteine And Simethicone In Improving Mucosal Visibility During Upper Endoscopy:A Single Blinded Randomized Controlled Trial[/INST] Yes</s>