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
Which of the following is false about hydatid cyst of liver 
Select and explain. 
A. MC cause is E. Granulosus, B. Investigation of choice is casoni’s test, C. Albendazole is scolicidal agent, D. PAIR is done if size > 5cm
B: Investigation of choice is casoni’s test
Answer: B: Investigation of choice is casoni’s test 
Explanation: IOC of hydatid cyst is serology. Casoni test is not preferred now.