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 large number of studies on the relationship between smoking and certain diseases conducted in a certain region are as follows.<image 1>Based on this information, the AR% comparing smoking and non-smoking in relation to the disease are
A. 48.0
B. 48.0-25.4=22.6
C. 48.0/25.4=1.89
D. (48.0-25.4) /48.0

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
D
A large number of studies on the relationship between smoking and certain diseases conducted in a certain region are as follows.<image 1>Based on this information, the AR% comparing smoking and non-smoking in relation to the disease are
A. 48.0
B. 48.0-25.4=22.6
C. 48.0/25.4=1.89
D. (48.0-25.4) /48.0

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