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
True about hydatid cyst of liver -a) Caused by E. granulosusb) In 80% cases cyst is singlec) Blood culture helpfuld) Surgery is the only treatment. 
Select and explain. 
A. ac, B. a, C. ad, D. ab
D: ab
Answer: D: ab 
Explanation: None