<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>: At high altitude, there can be acute changes and changes due to acclimatization.Acute mountain sicknessDyspnoea, dizziness, tiredness, tachycardia, palpitation, nausea, vomiting etc. At higher altitudes- pulmonary oedema and cerebral oedema may occur. Acclimatization changesHyperventilation leading to respiratory alkalosis Increased 2,3DPG- Hb-O2 dissociation curve shifts to right. Increased erythropoietin leading to absolute polycythemia with increased red cell mass. Increased renal excretion of bicarbonate Increased tissue vascularity Increased oxidative metabolism Increased diffusion capacity of the lungIncreased myoglobin 