system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following drug cause the following effect? (colonoscopic view)
assistant
The correct answer is  Bismuth cause tongue and stool discoloration. Senna(irritant purgative) cause colon pigmentation - melanosis coli. ref: katzung 12th ed