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': 'Noninvasive prenatal testing (NIPT) \nSelect and explain. \nA. Preconceptional gene testing on ova, B. Testing on maternal tissue, C. Maternal serum for evaluation of Down’s syndrome, D. Amniocentesis for evaluation of fetal chromosomal anomalies', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref. The Short Textbook of Obstetrics. Page. 778\n\xa0\nNON INVASIVE PRENATAL TESTING\n\nTargeted ultrasonography\nFetal blood cells in maternal blood\nDouble marker and triple screening\nMaternal serum estriol\n\nINVASIVE PRENATAL TESTING\n\nAmniocentesis\nChronic villus sampling\nCordocentesis', 'role': 'assistant'}]