Question: what engine is in a 2003 chevy trailblazer
[{'answer': 'LM4 5.3 L V8', 'provenance': [{'wikipedia_id': '1092156', 'title': 'Chevrolet TrailBlazer', 'start_paragraph_id': 11, 'start_character': 23, 'end_paragraph_id': 11, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::First generation (2001–2009).:Engines.\n'}]}]