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>Based on <image 1>, the muse Henrietta Moraes sat for artists Francis Bacon and Lucian Freud. Which female artist did she also sit for?
A. Maggi Hambling
B. Elisabeth Frink
C. Barbara Hepworth
D. Georgia O'Keeffe

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
Based on <image 1>, the muse Henrietta Moraes sat for artists Francis Bacon and Lucian Freud. Which female artist did she also sit for?
A. Maggi Hambling
B. Elisabeth Frink
C. Barbara Hepworth
D. Georgia O'Keeffe

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