A one year old child preents with short stature,lethargy and constipation.Clinical examination shows a palpable goiter.Laboratory investigations revealed a low T4 and elevated TSH which of the following is the most likely diagnosis.

• A. Central Hypothyroidism
• B. TSH Receptor Blocking Antibody
• C. Thyroid Dyshormonogenesis
• D. Thyroid Dysgenesis