How are you today? Fine. Thank you for asking. How are you? OR
You can worry about what the implications of such a question are. Why was that question asked? What is expected? Are there any right/wrong answers? What are the implications? Are you obligating yourself by answering? If you don't answer are you being curt/rude?
Do you complexify things, take them at face value or ignore them? Odd how different the strokes are for different folks.
