Question: what is the meaning of pcb in electronics
[{'answer': 'printed circuit board', 'provenance': [{'wikipedia_id': '65910', 'title': 'Printed circuit board', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]