<prompt> A 32 year old high altitude mountaineer is observed to have a hematocrit of 70 percent. Which of the following represents the most likely causeexplanationPolycythemia with increased red cell massRelative Polycythemia due to dehydrationPolycythemia due to hemoconcentrationPolycythemia with high altitude pulmonary edema  <response>: Polycythemia is usually seen in people living and high altitude and red blood cell mass is also increased Ref: guyton and hall textbook of medical physiology 12 edition page number:375,376,377 