Question: which tests are noninvasive and performed to detect chromosomal abnormalities in the fetus
[{'answer': 'ultrasonography', 'provenance': [{'wikipedia_id': '647286', 'title': 'Prenatal testing', 'start_paragraph_id': 19, 'start_character': 73, 'end_paragraph_id': 19, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Tests by Invasiveness.\n'}]}, {'answer': 'maternal serum screens', 'provenance': [{'wikipedia_id': '647286', 'title': 'Prenatal testing', 'start_paragraph_id': 19, 'start_character': 93, 'end_paragraph_id': 19, 'end_character': 115, 'bleu_score': 1.0, 'section': 'Section::::Tests by Invasiveness.\n'}]}, {'answer': 'non-invasive prenatal testing ( NIPT )'}, {'provenance': [{'wikipedia_id': '647286', 'title': 'Prenatal testing', 'start_paragraph_id': 19, 'start_character': 13, 'end_paragraph_id': 19, 'end_character': 676, 'bleu_score': 0.8933978945245871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16826048464310856722}, 'section': 'Section::::Tests by Invasiveness.\n'}]}]