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
A 60 years old man suffering from left colon Ca presented with acute Lt. colonic obstruction the treatment is -a) Primary resection and Hartman's procedureb) Defunctioning colostomyc) Rt. hemicolectomyd) Resection of whole Lt. bowel and end to end anastomosise) Conservative treatment 
Select and explain. 
A. acd, B. bcd, C. abc, D. abd
D: abd
Answer: D: abd 
Explanation: None