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>A 33-year-old man goes to his physician for a routine check of his health status. On physical examination he has the skin lesions seen here. These lesions have not increased in size since childhood. Which of the following is the most likely diagnosis? <image 1> 
A. Keratoacanthomas
B. Seborrheic keratoses
C. Fibroepithelial polyps
D. Nevocellular nevi
E. Epidermal inclusion cysts

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
D
A 33-year-old man goes to his physician for a routine check of his health status. On physical examination he has the skin lesions seen here. These lesions have not increased in size since childhood. Which of the following is the most likely diagnosis? <image 1> 
A. Keratoacanthomas
B. Seborrheic keratoses
C. Fibroepithelial polyps
D. Nevocellular nevi
E. Epidermal inclusion cysts

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