The number of RBCs in main incrases if he lives at a higher altitude because

Options

A. There is more oxygen
B. There is less oxygen
C. There are no germs in air
D. More heat is needed to warm the body

Answer

B

Explanation

At high altitude the atmospheric oxygen is very less, it stimulate hematopoietic stem cells to divide rapidly under the influence of erythropoietin resulting increase in number of RBCs count.