The correct option is (b) congenital disorders.
Explanation:
Both sickle-cell anaemia and Huntington's chorea are congenital genetic disorders.
Sickle-cell anaemia was first reported by James Herrick (1904). In this disease the patient's haemoglobin level reduced to half of the normal and the RBCs become sickle-shaped. A single mutation in a gene cause sickle-cell anaemia.
Huntington's chorea is caused by autosomal mutation which is dominant. The gene is present on chromosome number 4.
