In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.

Question: How many people can the building that Sin Salida was held in hold safely? Passage:Sin Salida (2015) (Spanish for "No Escape"/"No Exit") was a major professional wrestling event produced by the Mexican Lucha Libre-promotion Consejo Mundial de Lucha Libre (CMLL) that took place on Friday night July 17, 2015, in CMLL's main venue, Arena Mexico, nicknamed "the cathedral of Lucha Libre" in lieu of CMLL's normally scheduled Super Viernes ("Super Friday") show. The main event was a best two-out-of-three falls Lucha de Apuestas, or bet match where both Rey Escorpion and Ultimo Guerrero "bet" their hair on the outcome of the match and the loser was forced to have all his hair shaved off afterwards as per Lucha Libre traditions. The show also hosted two first-round matches of CMLL's 2015 En Busca de un Idolo ("In Search of an Idol") tournament where Esfinge wrestled Canelo Casas and Delta was supposed to face Blue Panther Jr., but wrestled Hechicero instead. The show contained four additional matches. Although it was not announced ahead of time, the first six matches of the show were broadcast live on the Terra Networks' home page for free.
Sin Salida (2015) (Spanish for "No Escape"/"No Exit") was a major professional wrestling event produced by the Mexican Lucha Libre-promotion Consejo Mundial de Lucha Libre (CMLL) that took place on Friday night July 17, 2015, in CMLL's main venue, Arena Mexico, nicknamed "the cathedral of Lucha Libre" in lieu of CMLL's normally scheduled Super Viernes ("Super Friday") show