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 piece of plastic is originally rectangular. Determine the shear strain $\gamma $_xy at the corner B if the plastic distorts as shown by the dashed lines. <image 1>
A. 11.6*10^(-3) rad
B. 1.6*10^(-3) rad
C. 11.6*10^(-2) rad
D. 16.6*10^(-3) rad

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 piece of plastic is originally rectangular. Determine the shear strain $\gamma $_xy at the corner B if the plastic distorts as shown by the dashed lines. <image 1>
A. 11.6*10^(-3) rad
B. 1.6*10^(-3) rad
C. 11.6*10^(-2) rad
D. 16.6*10^(-3) rad

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