Question: which type of blood cell becomes a macrophage
[{'answer': 'white blood cell', 'provenance': [{'wikipedia_id': '169270', 'title': 'Macrophage', 'start_paragraph_id': 1, 'start_character': 85, 'end_paragraph_id': 1, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '169270', 'title': 'Macrophage', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 736, 'bleu_score': 0.624592272500987, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1129182972299379188}, 'section': 'Section::::Abstract.'}]}]