Question: the amount of air remaining in the lungs after a normal tidal expiration is the
[{'answer': 'Residual volume', 'provenance': [{'wikipedia_id': '301329', 'title': 'Lung volumes', 'start_paragraph_id': 13, 'start_character': 22, 'end_paragraph_id': 13, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Values.\n'}]}]