Question: when do amy and bernadette come into the big bang theory
[{'answer': 'third season', 'provenance': [{'wikipedia_id': '27382642', 'title': 'The Big Bang Theory (season 3)', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27382642', 'title': 'The Big Bang Theory (season 3)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 618, 'bleu_score': 0.9796927878356411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5305756067988647948}, 'section': 'Section::::Abstract.'}]}]