Question: where does diffusion take place in our body
[{'answer': 'lungs', 'provenance': [{'wikipedia_id': '19908550', 'title': 'Diffusion', 'start_paragraph_id': 9, 'start_character': 42, 'end_paragraph_id': 9, 'end_character': 47, 'bleu_score': 1.0, 'section': 'Section::::Diffusion vs. bulk flow.\n'}]}, {'provenance': [{'wikipedia_id': '19908550', 'title': 'Diffusion', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 652, 'bleu_score': 0.7814428698959031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4337491140315073175}, 'section': 'Section::::Diffusion vs. bulk flow.\n'}]}]