Question: who said different elements combine together to form compounds
[{'answer': 'French chemist Joseph Proust', 'provenance': [{'wikipedia_id': '18339', 'title': 'Law of multiple proportions', 'start_paragraph_id': 3, 'start_character': 82, 'end_paragraph_id': 3, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18339', 'title': 'Law of multiple proportions', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 656, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11724250222860821706}, 'section': 'Section::::Abstract.'}]}]