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Sickle cell anaemia is characterised by

1. Leukemia
2. Polycythemia
3. Mental retardation
4. Haemolytic anaemia

Correct answer: Haemolytic anaemia

Solution

Sickle cell anaemia causes red blood cells to become rigid and sickle-shaped, making them fragile and easily destroyed. This leads to chronic haemolysis, so the condition is a haemolytic anaemia.

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