A 12 year old female patient has a developmental age of 8 years. Radiographic examination reveals mandibular dysplasia, delayed growth of the cranial vault and reduced facial height. Dental development is equivalent to 10 years. Panoramic radiographs reveal an abnormal tooth eruption pattern, crowding of the primary and permanent teeth, delayed eruption of the permanent canines and absence of the premolars. The most likely diagnosis is

hypoparathyroidism

hypothyroidism.

hypogonadism

hyposecretion of growth hormone