A 40 year old female patient complains of painless anterior neck mass. She has a history of hypothyroidism. Her blood work suggests increased TSH levels and decreased T3 and T4 levels. Circulating thyroid autoantibodies are also confirmed. The patient is suffering from: (A) De Quervain's thyroiditis, (B) Riedel's thyroiditis, (C) Hashimoto’s thyroiditis, (D) None of the above
Answer is C. None