Read the following passage and answer if the question is true or false.
Passage: Fetus in fetu (or foetus in foetu) is a developmental abnormality in which a mass of tissue resembling a fetus forms inside the body. An early example of the phenomenon was described in 1808 by George William Young.

Question: can a twin be born inside the other?

Is the answer True or False? Respond with only "True" or "False" and no additional text.
True (for the phenomenon of Fetus in Fetu)