Task: Question Answering
Input (English): Question: The ARP2 / 3 complex: 
 Options:  <1> It is an intermediate filament nucleator agent. <2> It is located in the centrosome. <3> It is responsible for the branching of the actin filaments. <4> It is part of the nuclear sheet. <5> Involved in the formation of transport vesicles.
Output (English): 3