This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Features of right side carcinoma colon are
I. Obstruction
II. Altered bowel habit
III. Anemia
IV. Melena 
Select and explain. 
A. 1 only, B. 1 and 2, C. 3 and 4, D. 2, 3 and 4
C: 3 and 4
Answer: C: 3 and 4 
Explanation: Right sided Ca. Bleeds ( melena) causing anemia.