Question: Which one, Boğaziçi University or Basilica Cistern, was built in the 6th century during the reign of Byzantine Emperor Justinian I?
Sentence (from "Basilica Cistern"): The Basilica Cistern (Turkish: "Yerebatan Sarnıcı – "Cistern Sinking Into Ground"" ), is the largest of several hundred ancient cisterns that lie beneath the city of Istanbul (formerly Constantinople), Turkey.
Relevant evidence: Yes