Question: how much money does the nih invest annually in medical research
[{'answer': 'US $26.4 billion', 'provenance': [{'wikipedia_id': '46174', 'title': 'National Institutes of Health', 'start_paragraph_id': 2, 'start_character': 316, 'end_paragraph_id': 2, 'end_character': 331, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46174', 'title': 'National Institutes of Health', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 331, 'bleu_score': 0.9064991042368821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8457033685464823210}, 'section': 'Section::::Abstract.'}]}]