Consider the following statements.
1. The sickle cell anaemia is a genetic disease common in tropical and sub-tropical countries.
2. The sickle-cell anaemia is due to mutation in b-globulin gene.
3. Due to the sickle-shaped anaemia, oxygen carrying capacity of the haemoglobin decreases.
Which of the statements given above is/are correct?

A. Only 1

B. 1, 2 and 3

C. 2 and 3

D. Only 3

Answer: Option B