Sentence: Sprague-Dawley male rats were treated with levodopa ( LD ) , betaine ( Bet ) , levodopa plus betaine ( LD/Bet ) , levodopa plus benserazide ( LD/Ben ) , levodopa plus betaine-benserazide ( LD/Bet-Ben ) , and the controls with vehicle for 10 consecutive days , orally .
Drug combination annotation:
[{'class': 'POS', 'spans': ['levodopa', 'benserazide'], 'is_context_needed': True}, {'class': 'COMB', 'spans': [2, 3, 6, 7], 'is_context_needed': True}]