Question: who plays the male hippo in madagascar 2
[{'answer': 'will.i.am', 'provenance': [{'wikipedia_id': '3858746', 'title': 'Madagascar: Escape 2 Africa', 'start_paragraph_id': 1, 'start_character': 714, 'end_paragraph_id': 1, 'end_character': 723, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3858746', 'title': 'Madagascar: Escape 2 Africa', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 51, 'bleu_score': 0.6803749333171201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15611792843099997311}, 'section': 'Section::::Cast.\n'}]}]