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>The figure below <image 1> shows a stable structure of a protein that is to be used for each part of this problem. The dashed line divides the structure into three regions labeled A, B, and C in the figure. Does this protein have quaternary structure and how do you reach that conclusion?
A. True
B. False

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
The figure below <image 1> shows a stable structure of a protein that is to be used for each part of this problem. The dashed line divides the structure into three regions labeled A, B, and C in the figure. Does this protein have quaternary structure and how do you reach that conclusion?
A. True
B. False

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