Task: Question Answering
Input (English): Question: Osmium oxide (VIII), OsO4: 
 Options:  <1> It is a compound in a state of oxidation very common among transition metals. <2> It is the only binary compound of osmium with oxygen. <3> It has the structure of rhenium trioxide. <4> It is inert compared to alkaline hydroxides. <5> It is used as an oxidant in organic chemistry.
Output (English): 5