Task: Question Answering
Input (English): Question: An amine, due to the pair of non-bonding electrons that nitrogen possesses: 
 Options:  <1> It can be considered as an electrophile. <2> It can be considered as a Lewis acid. <3> It can act as a nucleophilic reagent attack center. <4> It can be considered as a nucleophile. <5> It is an example of apolar product.
Output (English): 4