Question: how many goals did didier drogba scored for chelsea fc
[{'answer': '4', 'provenance': [{'wikipedia_id': '1031793', 'title': 'Didier Drogba', 'start_paragraph_id': 2, 'start_character': 204, 'end_paragraph_id': 2, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]