Which of the following is a true statement?

Q. Which of the following is a true statement?

A.            Tryptophan and tyrosine are significantly more polar than phenylalanine

B.            Leucine is commonly used as an ingredient in the buffers of SDS page

C.            Aspartate is an essential amino acid

D.            Lysine is a non-essential amino acid

Answer: Tryptophan and tyrosine are significantly more polar than phenylalanine