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 shows (a) and (b) two sections, (a) is a circle of rectangular holes, (b) a square u and v with circular holes are the spindle of the center. There are four answers about the moment of inertia L. and I, among which the correct is<image 1>
A. l(a)>1,(a);l(b)=l(b)
B. l.(a) >L(a);l(b)>l,(b)
C. l.(a) >2(a);l(b)>l,(b)
D. l.(a) >L(a);l(b)>2,(b)

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 shows (a) and (b) two sections, (a) is a circle of rectangular holes, (b) a square u and v with circular holes are the spindle of the center. There are four answers about the moment of inertia L. and I, among which the correct is<image 1>
A. l(a)>1,(a);l(b)=l(b)
B. l.(a) >L(a);l(b)>l,(b)
C. l.(a) >2(a);l(b)>l,(b)
D. l.(a) >L(a);l(b)>2,(b)

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