Question: what is the primary stain in the gram stain
[{'answer': 'crystal violet', 'provenance': [{'wikipedia_id': '12935', 'title': 'Gram stain', 'start_paragraph_id': 2, 'start_character': 204, 'end_paragraph_id': 2, 'end_character': 218, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12935', 'title': 'Gram stain', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 246, 'bleu_score': 0.9529077664391161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3617370569781432533}, 'section': 'Section::::Uses.:Staining mechanism.\n'}]}]