Which one of the following is the only active gene in the inactivated X chromosome?

Which one of the following is the only active gene in the inactivated X chromosome? Correct Answer XIST

The X inactive specific transcript (XIST in humans/ Xist in mice) gene, is located in the XIC, it’s expressed exclusively from the inactive X chromosome, producing a 17 kb non-coding RNA that is not translated. Ribosome genes are in nucleolus.
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