This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
[{'content': 'Earliest symptom of carcinoma rectum is \nSelect and explain. \nA. Pain, B. Alteration of bowel habits, C. Bleeding PR, D. Tenesmus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Early symptoms of rectal cancer # Bleeding per rectum # Tenesmus # Early morning diarrhoea Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1231', 'role': 'assistant'}]