Question: what is the sl unit of electric charge
[{'answer': 'coulomb', 'provenance': [{'wikipedia_id': '9804', 'title': 'Electric charge', 'start_paragraph_id': 4, 'start_character': 46, 'end_paragraph_id': 4, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]