A 76 year old woman presents with weight gain, subjective memory loss, dry skin and cold intolerance. On examination she is found to have a multinodular goiter. Laboratory findings reveal a low serum T4 and elevated TSH. A. What diagnosis would this woman's history, physical, and Laboratory tests suggest? B. Explain the possible relationship between the diagnosis and her weight gain, dry skin, cold intolerance and subjective memory loss? C. What type of treatment would be indicated?