Use reasoning to lead to the answer of the following question:
If you found yourself explaining what a rook was named a rook, it might be because a child is calling it a what?\nOptions:\n- juggling\n- trees\n- chess set\n- flying\n- castle

castle
Explaining what a rook was named rook is definitely when explaining such things to a child.

Child may definitely call a rook as castle.

.

Therefore, the answer is castle