Question: what are the four main types of taste buds on the tongue
[{'answer': 'salty', 'provenance': [{'wikipedia_id': '301076', 'title': 'Taste bud', 'start_paragraph_id': 1, 'start_character': 345, 'end_paragraph_id': 1, 'end_character': 350, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'sour', 'provenance': [{'wikipedia_id': '301076', 'title': 'Taste bud', 'start_paragraph_id': 1, 'start_character': 352, 'end_paragraph_id': 1, 'end_character': 356, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'bitter', 'provenance': [{'wikipedia_id': '301076', 'title': 'Taste bud', 'start_paragraph_id': 1, 'start_character': 358, 'end_paragraph_id': 1, 'end_character': 364, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'sweet', 'provenance': [{'wikipedia_id': '301076', 'title': 'Taste bud', 'start_paragraph_id': 1, 'start_character': 366, 'end_paragraph_id': 1, 'end_character': 371, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '301076', 'title': 'Taste bud', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 948, 'bleu_score': 0.92393350200804, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1401094437744452774}, 'section': 'Section::::Abstract.'}]}]