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>Skin tests were used to screen for hepatic schistosomiasis in rural villages along the river and the results were shown in the table.<image 1>The Pr+ was
A. 0.69
B. 0.98
C. 0.02
D. 0.94

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
A
Skin tests were used to screen for hepatic schistosomiasis in rural villages along the river and the results were shown in the table.<image 1>The Pr+ was
A. 0.69
B. 0.98
C. 0.02
D. 0.94

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