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
True about Ca colon -
assistant
The correct answer is  Answer 'a' i.e. 1/3rd of cases shows liver metastases; 'b' i.e. Obstruction common in sigmoid colon 'c' i.e. CEA is useful for prognostic impoance