Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: The hydrogen atoms with partial positive charge of one water molecule can interact with the oxygen atoms, with negative partial charge of another water molecule. What name does this interaction receive? : 
 Options:  <1> Hydrophobic <2> Polar. <3> Hydrogen bridge. <4> Van der Wall. <5> Zwitterion.
