Which of the following statements are correct? (i) Failure of segregation of chromatids during cell division results in aneuploidy. (ii) Chromosomal disorders are mainly determined by alteration or mutation in a single gene. (iii) Thalassemia and cystic fibrosis are Mendelian disorders. (iv) Sickle cell anaemia is an X-linked trait. (v) Haemophilia is an autosome linked recessive disease.

• A. (i) and (iii)
• B. (i), (iii) and (iv)
• C. (iii) and (iv)
• D. (ii) and (iii)