The correct answer is all cells are generated from the pre-existing cells.
Rudolf Virchow was a German pathologist, doctor, and anthropologist well-familiar for his work in the development of cell theory. He is known as the father of pathology. He is accredited with many essential findings.
He is famous for his scientific contribution in cell theory as he was one of the first to demonstrate that the origin of the cells had taken place from the differentiation of the pre-existing cells.