Task: Question Answering
Input (English): Aphids are small insects that sometimes live near ants. The ants protect the aphids from predators. The aphids produce a sweet substance that the ants eat. Which statement describes the relationship between ants and aphids?  
 (A) Both ants and aphids benefit. (B) Both ants and aphids are unaffected. (C) The ants benefit and the aphids are harmed. (D) The aphids benefit and the ants are unaffected.
Output (English): A