Question: over which bridge is the london marathon run
[{'answer': 'Tower Bridge', 'provenance': [{'wikipedia_id': '48804', 'title': 'London Marathon', 'start_paragraph_id': 23, 'start_character': 309, 'end_paragraph_id': 23, 'end_character': 321, 'bleu_score': 1.0, 'section': 'Section::::Course.\n'}]}, {'provenance': [{'wikipedia_id': '48804', 'title': 'London Marathon', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 505, 'bleu_score': 0.90143870053672, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3925911258361362077}, 'section': 'Section::::Course.\n'}]}]