You are answering a USMLE-style medical question. Question: An investigator is studying the frequency of polycythemia in a population of a remote, mountainous region. A representative sample of 100 men shows a normal distribution of hemoglobin concentration with a mean concentration of 17 g/dL and a standard error of 0.1 g/dL. Which of the following best represents the probability that a subject will have a hemoglobin concentration greater than 18 g/dL? Options: A) 30% B) 15% C) 95% D) 99% Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.