Why do people shake hands?
In many cultures shaking hands is used as a form of greeting as well as a sign to ratify when an agreement was reached. It's believed people started shaking hands as a way to demonstrate they don't hold weapons in their right hand and that they mean well. Traditionally handshake is performed with right hands, sometimes right hand is supported by the left hand to convey extra respect.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
4. If no context is provided use your internal knowledge to answer.
system
(Optional) Context information is below.
----------------

----------------
Answer the following query.
Why do people shake hands?

user
In many cultures shaking hands is used as a form of greeting as well as a sign to ratify when an agreement was reached. It's believed people started shaking hands as a way to demonstrate they don't hold weapons in their right hand and that they mean well. Traditionally handshake is performed with right hands, sometimes right hand is supported by the left hand to convey extra respect.
assistant