A) cholera
B) malaria
C) high blood pressure
D) hepatitis
Correct Answer: B
Solution :
Sickle-cell anaemia is a blood disease in which blood cells reveal an abnormal crescent (sickle) shape due to the point mutation at 6th position of \[\beta -\]haemoglobin chain (glutamic acid \[\to \]valine). The resulted sickle-shape RBCs are resistant to attack by Plasmodium the vector of malarial disease.
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