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 left side Ca colon are :a) Anemiab) Obstructionc) Altered bowel habitd) Melenae) Feculent vomiting 
Select and explain. 
A. a, B. c, C. bc, D. ad
C: bc
Answer: C: bc 
Explanation: None