Read this and answer the question. If the question is unanswerable, say "unanswerable".

Rajasthan is famous for its forts, carved temples, and decorated havelis, which were built by Rajput kings in pre-Muslim era Rajasthan.[citation needed] Rajasthan's Jaipur Jantar Mantar, Mehrangarh Fort and Stepwell of Jodhpur, Dilwara Temples, Chittorgarh Fort, Lake Palace, miniature paintings in Bundi, and numerous city palaces and haveli's are part of the architectural heritage of India. Jaipur, the Pink City, is noted for the ancient houses made of a type of sandstone dominated by a pink hue. In Jodhpur, maximum houses are painted blue. At Ajmer, there is white marble Bara-dari on the Anasagar lake. Jain Temples dot Rajasthan from north to south and east to west. Dilwara Temples of Mount Abu, Ranakpur Temple dedicated to Lord Adinath in Pali District, Jain temples in the fort complexes of Chittor, Jaisalmer and Kumbhalgarh, Lodurva Jain temples, Mirpur Jain Temple, Sarun Mata Temple kotputli, Bhandasar and Karni Mata Temple of Bikaner and Mandore of Jodhpur are some of the best examples.

What are the notable houses in Jaipur made from?
a type of sandstone dominated by a pink hue