Which ones are programming languages, out of C, Java, Node.js, Python, HTML, BigData, Spark?
Well, C, Java and Python are programming languages. 
While HTML is a language, it is a markup language and not a programming language. Node.js is actually a framework built on top of Javascript, so it can't be classified as a language. 
BigData is a broader term used for storing, processing and usage of large amounts of data. Spark is one of the most popular distributed data processing frameworks. Spark can be used from multiple languages.
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.
Which ones are programming languages, out of C, Java, Node.js, Python, HTML, BigData, Spark?

user
Well, C, Java and Python are programming languages. 
While HTML is a language, it is a markup language and not a programming language. Node.js is actually a framework built on top of Javascript, so it can't be classified as a language. 
BigData is a broader term used for storing, processing and usage of large amounts of data. Spark is one of the most popular distributed data processing frameworks. Spark can be used from multiple languages.
assistant