Question

is a blood disorder caused by the lack of vitamin b - 12.
a sickle - cell disease
b hemolytic anemia
c pernicious anemia
d polycythemia

Explanation:

• Sickle - cell disease is a genetic disorder, not caused by vitamin B - 12 deficiency.
• Hemolytic anemia is due to the destruction of red blood cells, not vitamin B - 12 lack.
• Pernicious anemia is specifically caused by a lack of vitamin B - 12 which affects the production of healthy red blood cells.
• Polycythemia is characterized by an over - production of red blood cells, not related to vitamin B - 12 deficiency.

Answer:

C. Pernicious anemia