I want to know the answer to the following question:
What is the child of Mary known to be famous for according to  Giovanni Maria Mastai-Ferretti ?
All the background I'm provided with is that "He stated that Mary, rather than being cleansed after sin, was completely prevented from contracting Original Sin in view of the foreseen merits of Jesus Christ, the Savior of the human race.". Is that enough to answer the question?
Answer: yes