A hero is someone who sacrifices himself for a greater cause.
Explanation:
The sentence topic is an important structure that helps make the paragraph of argumentation much more organized and interesting. It allows the author of the text to develop the subject more easily, ensuring the success of the essay. In other words, a topic sentence is the central or core idea of the development paragraph, that is, it is a summary of the point of view that the text will address.
Based on this, we can conclude that the phrase "A hero is someone who sacrifices himself for a greater cause" is an example of a topic sentence that will establish a relationship with the other sentences that will support the message that is being passed
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