Task: Question Answering
Input (English): Question: The nitrogen: 
 Options:  <1> It is a highly reactive gas at room temperature. <2> Nitrogen molecules are constituted by two atoms linked together by a single bond. <3> It has a higher reactivity than other isoelectronic molecules such as CO, CNo or NO +. <4> At a sufficient temperature, it reacts with H2 to give NH3. <5> It barely forms binary compounds with the rest of the elements of the Periodic Table.
Output (English): 4