This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification and metabolism of amino acids, Subject name: Biochemistry
Which of the following is polar amino acid - 
Select and explain. 
A. Tryptophan, B. Methionine, C. Glutamic acid, D. Isoleucine
C: Glutamic acid
Answer: C: Glutamic acid 
Explanation: Glutamate/ glutamic acid is a negatively charged or acidic amino acid. Rest all are non-polar in the options Note:-Go through treasure for list of polar and non polar amino acids