Question: what part did johnny galecki play in christmas vacation
[{'answer': 'Rusty Griswold', 'provenance': [{'wikipedia_id': '2318278', 'title': 'Johnny Galecki', 'start_paragraph_id': 7, 'start_character': 167, 'end_paragraph_id': 7, 'end_character': 181, 'bleu_score': 1.0, 'section': 'Section::::Career.\n'}]}, {'provenance': [{'wikipedia_id': '2318278', 'title': 'Johnny Galecki', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 568, 'bleu_score': 0.9295856914313401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16773272884347477060}, 'section': 'Section::::Career.\n'}]}]