Question: when was the first extended cab truck made
[{'answer': '1973', 'provenance': [{'wikipedia_id': '47877', 'title': 'Pickup truck', 'start_paragraph_id': 6, 'start_character': 576, 'end_paragraph_id': 6, 'end_character': 580, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '47877', 'title': 'Pickup truck', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 565, 'bleu_score': 0.872800084408142, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11813939153131592354}, 'section': 'Section::::Design and features.\n'}]}]