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
Earliest symptom of carcinoma rectum is 
Select and explain. 
A. Pain, B. Alteration of bowel habits, C. Bleeding PR, D. Tenesmus
C: Bleeding PR
Answer: C: Bleeding PR 
Explanation: Early symptoms of rectal cancer # Bleeding per rectum # Tenesmus # Early morning diarrhoea Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1231