Question: the property of a liquid that causes small drops to be spherical is called
[{'answer': 'surface tension', 'provenance': [{'wikipedia_id': '41068', 'title': 'Drop (liquid)', 'start_paragraph_id': 3, 'start_character': 47, 'end_paragraph_id': 3, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Surface tension.\n'}]}, {'provenance': [{'wikipedia_id': '41068', 'title': 'Drop (liquid)', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 360, 'bleu_score': 0.9712154609069981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13775614093411101049}, 'section': 'Section::::Surface tension.\n'}]}]