My five-year-old just asked me- Mummy , can two girls marry each other? How am I supposed to respond to this question?

Tell the truth. Explain to her the nature of man and women and in this case mum and dad. Many times in Singapore i notice parents tend to overly baby talk. That is not healthy. We should always tell the truth no matter if its an object, person or even situation. It may see trivial to us or a joke but not to their tiny winey simple minds.