Question: what does pvc stand for in medical terms
[{'answer': 'premature ventricular contraction', 'provenance': [{'wikipedia_id': '230476', 'title': 'Premature ventricular contraction', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]