Context : Káťa Kabanová (also known in various spellings including Katia, Katja, Katya, and Kabanowa) is an opera in three acts, with music by Leoš Janáček to a libretto by Vincenc Červinka, based on The Storm, a play by Alexander Ostrovsky. 
Answer : The Storm
The Káťa Kabanová is based upon what?