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: Microbiology
[{'content': "The test involving an intradermal injection of sterilised fluid from an infectious cyst is called? \nSelect and explain. \nA. Casoni's test, B. Schick test, C. Patch test, D. Dick's test", 'role': 'user'}, {'content': 'Answer: A \nExplanation: The Casoni test is a skin test used in the diagnosis of hydatid disease. The test involves the intradermal injection of 0.5ml of sterilised fluid from hydatid cysts. A wheal response occurring at the injection site within 20 minutes is considered positive. Schick test is a test used to determine whether or not a person is susceptible to diphtheria. A patch test is a method used to determine if a specific substance causes allergic inflammation of the skin. The Dick test is a laboratory test designed to indicate whether or not a person is immune to scarlet fever.', 'role': 'assistant'}]