Must Be A Question It Says

Riddle: There are two sisters: one gives birth to the other and she, in return, gives birth to the first. Who are the two sisters?

Answer: Day and Night.

Source: https://www.riddles.com/4592

There are two sisters: one gives birth to the other and she, in return, gives birth to the first. Who are the two sisters? — Must be a question it says by riddlemaster liz v1.

Riddle: There are two sisters: one gives birth to the other and she, in return, gives birth to the first. Who are the two sisters? Answer: Day and Night. — by riddlemaster liz v2.