Identifying Hydrophilic Amino Acids

Amino acids are the building blocks of proteins, and each amino acid has distinct properties that influence protein structure and function. One of the key properties of amino acids is their side chain, which can determine whether they are hydrophobic, hydrophilic, acidic, or basic. In this context, consider the following question:

Which of the following amino acids is classified as hydrophilic due to the presence of a polar side chain?