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 healthy gallbladder on laprotomy are -a) Typical "sea-green" coloredb) Wall is thin & elasticc) Cannot be emptiedd) Not easily visible 
Select and explain. 
A. ac, B. a, C. ad, D. ab
D: ab
Answer: D: ab 
Explanation: None