This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': 'The test having the fastest lab processing time for karyotype assessment is \nSelect and explain. \nA. Amniocentesis, B. Cordocentesis, C. Chorionic villus sampling, D. Doppler flow ultrasound', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Amniocentesis, cordocentesis, cystic hygroma aspiration, and chorionic villus sampling are techniques for obtaining fetal tissues that are amenable to cytogenetic analysis.Amniotic fluid cells require tissue culture to obtain adequate cell numbers for analysis.Chorionic villi can be harvested directly for extremely rapid diagnosis or can be cultured for higher banding (increased detail).', 'role': 'assistant'}]