Question: when do meredith and derek start dating in season 3
[{'answer': '`` I', 'provenance': [{'wikipedia_id': '6173298', 'title': "Grey's Anatomy (season 3)", 'start_paragraph_id': 1, 'start_character': 239, 'end_paragraph_id': 1, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]