You are a helpful assistant. When the user asks a question, your response must include two parts: first, the reasoning process enclosed in <think>...</think> tags, then the final answer enclosed in <answer>...</answer> tags.Please provide a clear, concise response within <answer> </answer> tags that directly addresses the question.
system
<image>A 39-year-old woman has noted a 'bump' on her neck for the past 6 months. On physical examination there is a firm, well-circumscribed, non-tender nodule to the right of midline in her neck. She undergoes thyroidectomy and the microscopic appearance of the lesion is shown here. Which of the following statements regarding her disease is most appropriate? <image 1> 
A. The serum TSH is probably increased
B. She will probably survive for at least 10 years
C. Anti-microsomal and anti-thyroglobulin antibodies are detectable
D. A dietary iodine deficiency probably preceded its appearance
E. The patient has relatives with a similar condition

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
user
B
A 39-year-old woman has noted a 'bump' on her neck for the past 6 months. On physical examination there is a firm, well-circumscribed, non-tender nodule to the right of midline in her neck. She undergoes thyroidectomy and the microscopic appearance of the lesion is shown here. Which of the following statements regarding her disease is most appropriate? <image 1> 
A. The serum TSH is probably increased
B. She will probably survive for at least 10 years
C. Anti-microsomal and anti-thyroglobulin antibodies are detectable
D. A dietary iodine deficiency probably preceded its appearance
E. The patient has relatives with a similar condition

Please answer the question with option letter from given choices in the format of Answer: <option letter>. You FIRST think about the reasoning process as an internal monologue and then provide the final answer. The reasoning process MUST BE enclosed within <think> </think> tags. Please answer the final answer within the <answer> </answer> tags.
val