Chemical Coordination and Integration

Cretinism is caused by the deficiency of thyroid hormones (hypothyroidism) during foetal life or early childhood, often due to iodine deficiency in the mother's diet.
It is characterised by stunted growth, mental retardation, low intelligence quotient and abnormal skin.
It is a hormonal (endocrine) deficiency disorder, not a disease inherited through defective genes.
Haemophilia is an X-linked recessive hereditary disorder.
Cystic fibrosis and thalassaemia are autosomal recessive hereditary disorders.
So the one that is not a hereditary disease is cretinism.