Based on the premise "They were built at the very beginning of the 16th century by Sultan al-Ghuri, the last Mameluke ruler, and his mausoleum at the heart of the development is now a cultural center hosting regular performances of the Whirling Dervishes (who achieve religious ecstasy by circling around in continuous motion).", can we conclude the hypothesis "Sultan al-Ghuri ruled for 75 years." is true (see options)?

Possible answers: --yes --it is not possible to tell --no
it is not possible to tell