Question: who discovered the nucleus by bombarding gold foil
[{'answer': 'Hans Geiger', 'provenance': [{'wikipedia_id': '319834', 'title': 'Geiger–Marsden experiment', 'start_paragraph_id': 1, 'start_character': 419, 'end_paragraph_id': 1, 'end_character': 430, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ernest Marsden', 'provenance': [{'wikipedia_id': '319834', 'title': 'Geiger–Marsden experiment', 'start_paragraph_id': 1, 'start_character': 435, 'end_paragraph_id': 1, 'end_character': 449, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '319834', 'title': 'Geiger–Marsden experiment', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 551, 'bleu_score': 0.9382880328341491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3395850080679812303}, 'section': 'Section::::Abstract.'}]}]