Question: Mnaseas is reckoned to have been a pupil of a scholar who was chief librarian at what library?
Sentence (from "Eratosthenes"): Eratosthenes of Cyrene ( ; Greek: Ἐρατοσθένης ὁ Κυρηναῖος , ] ;  – ) was a Greek mathematician, geographer, poet, astronomer, and music theorist.
Relevant evidence: No