The answer to that question is false
The main idea is what something is mostly about. Main ideas are typically found in a literary passage. Central ideas are found in an informational text. The theme is the lesson or message that the writer wants to get across in his or her story.
Use Less Paper and Wood
Eat Less Beef
Act on the Solutions to Global Climate Change
Invest in Rainforest Communities
You ask yourself, "what is the main idea?" "what is the story about?". The theme is like the things that the story surrounds.