<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 Usefulness Of Bifidobacterium Longum Bb536 Intake In Elderly Patients With Chronic Constipation: A Prospective Randomized, Double-Blind Trial[/INST] Yes</s>