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>What is a <image 1>?
A. Are formally deLned and are enforced by designated people
B. Norms for routine or casual interaction. 'Everyday behaviors.' 
C. Specific statements that people hold to be true or false
D. Have great moral signiLcance. 'taboos' 

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
What is a <image 1>?
A. Are formally deLned and are enforced by designated people
B. Norms for routine or casual interaction. 'Everyday behaviors.' 
C. Specific statements that people hold to be true or false
D. Have great moral signiLcance. 'taboos' 

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