Question: what does the m in bmw m3 stand for
[{'answer': 'Motorsport', 'provenance': [{'wikipedia_id': '1158851', 'title': 'BMW M', 'start_paragraph_id': 1, 'start_character': 28, 'end_paragraph_id': 1, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1158851', 'title': 'BMW M', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 598, 'bleu_score': 0.807839760051122, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8532319628240994836}, 'section': 'Section::::Abstract.'}]}]