Question: how many different type of cancer are there
[{'answer': 'over 100', 'provenance': [{'wikipedia_id': '13059707', 'title': 'List of cancer types', 'start_paragraph_id': 1, 'start_character': 338, 'end_paragraph_id': 1, 'end_character': 346, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13059707', 'title': 'List of cancer types', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 389, 'bleu_score': 0.9720210313175831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2064409190313109203}, 'section': 'Section::::Abstract.'}]}]