Question

Leonardo was fascinated with human anatomy. He conducted medical research in hospitals in Florence and Rome. His notebooks are filled with sketches of bones, muscles, and organs. For example, he made detailed drawings of a human fetus and a human heart.

Which sentence is the topic sentence?
 

He conducted medical research in hospitals in Florence and Rome.

His notebooks are filled with sketches of bones, muscles, and organs.

Leonardo was fascinated with human anatomy.

For example, he made detailed drawings of a human fetus and a human heart

Answer 1

I would probably say the third one: Leonardo was fascinated with anatomy. Hope this helped! 

Answer 2

Leonardo was fascinated with human anatomy