I want to know the answer to the following question:
Who wrote a book about Tito questioning his true origin?
All the background I'm provided with is that "Tito's personal doctor, Aleksandar Matunović, wrote a book about Tito in which he also questioned his true origin, noting that Tito's habits and lifestyle could only mean that he was from an aristocratic family.". Is that enough to answer the question?
Answer: yes