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: Unknown
[{'content': 'The test having the fastest lab processing time for karyo type assessment is \nSelect and explain. \nA. Amniocentesis, B. Cordocentesis, C. Chorionic villus sampling (CVS), D. Doppler flow ultrasound', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Amniocentesis, cordocentesis, cystic hygroma aspiration, and chorionic villus samplingare techniques of obtaining fetal tissues that are amenable to cytogenetic analysis.\nAmniotic fluid cellsrequire tissue culture to obtain adequate cell numbers for analysis.\nChorionic villi can be harvested directlyfor extremely rapid diagnosis or can be cultured for higher banding (increased detail).', 'role': 'assistant'}]