Question: an element of atomic number 29 belongs to which block
[{'answer': 'd - block', 'provenance': [{'wikipedia_id': '33563967', 'title': 'Block (periodic table)', 'start_paragraph_id': 21, 'start_character': 269, 'end_paragraph_id': 21, 'end_character': 279, 'bleu_score': 1.0, 'section': 'Section::::Characteristics.:f-block.\n'}]}]