<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A student is experimenting with the effects of nitric oxide in the body. He used a variety of amino acid isolates and measured the resulting nitric oxide levels and the physiological effects on the body. The amino acids function as substrates for nitric oxide synthase. After supplement administration, blood vessels dilated, and the systemic blood pressure decreased. Which of the following amino acids was used in this study?? A: Histidine, B: Arginine, C: Methionine, D: Leucine, E: Tyrosine,  <response>: This question is asking about which amino acid is a substrate for nitric oxide synthase to produce nitric oxide. Nitric oxide is a signaling molecule that causes vasodilation and decreases blood pressure. Of the amino acid choices, arginine is the main substrate used by nitric oxide synthase to produce nitric oxide. Histidine, methionine, leucine, and tyrosine do not serve this function. Therefore, the answer is arginine.B: Arginine 