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 population of an area at the beginning of 2010 was 2,528, and the incidence of a disease in 2010 was shown in the graph below, with no births, deaths, in-migrants or refusals to be examined during the period. <image 1> The incidence in 2010 was
A. 0.24%
B. 0.40%
C. 0.32%
D. 0.44%

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
The population of an area at the beginning of 2010 was 2,528, and the incidence of a disease in 2010 was shown in the graph below, with no births, deaths, in-migrants or refusals to be examined during the period. <image 1> The incidence in 2010 was
A. 0.24%
B. 0.40%
C. 0.32%
D. 0.44%

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