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 picture shows the microscopy of Mr Tan's gastric tumour. Which of the following statements is CORRECT?  <image 1> 
A. The findings show an adenoma
B. The findings show a squamous cell carcinoma
C. The findings show intestinal type adenocarcinoma
D. The findings show diffuse signet ring cell adenocarcinoma

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
C
The picture shows the microscopy of Mr Tan's gastric tumour. Which of the following statements is CORRECT?  <image 1> 
A. The findings show an adenoma
B. The findings show a squamous cell carcinoma
C. The findings show intestinal type adenocarcinoma
D. The findings show diffuse signet ring cell adenocarcinoma

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