<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 29-year-old female presents to the family physician concerned over the blue-black discoloration of her sclera and skin. She notes that at the end of her day, there are black stains in her underwear. The incomplete breakdown of which of the following amino acids is responsible for this presentation?? A: Tyrosine, B: Valine, C: Leucine, D: Isoleucine, E: Methionine,  <response>: This is a question about a medical condition that is causing blue-black discoloration of the sclera white part of the eye and skin, as well as black stains in the underwear. The key information is the blue-black discoloration and incomplete breakdown of an amino acid. This sounds like a disorder of tyrosine metabolism, specifically alkaptonuria. In alkaptonuria, a defect in the enzyme homogentisic acid oxidase leads to a buildup of homogentisic acid, an intermediate in the breakdown of the amino acid tyrosine. Homogentisic acid polymerizes and leads to the dark discoloration.A: Tyrosine 