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 patient comes in complaining of abdominal pain and the doctor orders an x-ray of the abdomen. Afterwards, you compare it to the last image the patient had taken and you see this x-ray. What is the name of this x-ray position? <image 1>
A. KUB (Kidneys, ureter, and bladder)
B. Lateral Decubitus
C. Upright Abdominal x-ray
D. IVP (Intra venous Pyelogram)

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
A patient comes in complaining of abdominal pain and the doctor orders an x-ray of the abdomen. Afterwards, you compare it to the last image the patient had taken and you see this x-ray. What is the name of this x-ray position? <image 1>
A. KUB (Kidneys, ureter, and bladder)
B. Lateral Decubitus
C. Upright Abdominal x-ray
D. IVP (Intra venous Pyelogram)

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