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 life expectancy and the number of deaths due to cardiovascular and cerebrovascular diseases and malignant neoplasms in 2010 for each age group of the working population aged 20-59 in a certain city were shown in the table below.<image 1> Which of these two diseases is the greater health threat to the city's occupational population?
A. cardiovascular and cerebrovascular diseases
B. malignant neoplasms
C. The threat is just as great.
D. The threat cannot be judged.

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
The life expectancy and the number of deaths due to cardiovascular and cerebrovascular diseases and malignant neoplasms in 2010 for each age group of the working population aged 20-59 in a certain city were shown in the table below.<image 1> Which of these two diseases is the greater health threat to the city's occupational population?
A. cardiovascular and cerebrovascular diseases
B. malignant neoplasms
C. The threat is just as great.
D. The threat cannot be judged.

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