Question: when is a baseball pitched at its fastest
[{'answer': 'four - seam fastball', 'provenance': [{'wikipedia_id': '467802', 'title': 'Fastball', 'start_paragraph_id': 35, 'start_character': 311, 'end_paragraph_id': 35, 'end_character': 330, 'bleu_score': 1.0, 'section': 'Section::::Pitches.:Side-arm fastball.\n'}]}]