Question: what type of polymers have the ester functional group
[{'answer': 'monomers', 'provenance': [{'wikipedia_id': '6247', 'title': 'Condensation polymer', 'start_paragraph_id': 1, 'start_character': 460, 'end_paragraph_id': 1, 'end_character': 468, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]