I expand in dim light when you look closely, but when the teacher asks a question in class, I am the one raising a hand. What am I?
A pupil
'Pupil' is a play on words: it refers both to the opening in the center of the eye that expands in darkness and to a student in a school classroom.
About this riddle
Wordplay riddles depend on how words look and sound. Watch for double meanings, hidden words and letters you can move or remove.
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