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>An ideal gas is taken from state 1 to state 2 and then to state 3.  <image 1>If the process 1-2 is adiabatic and 2-3 is isothermal, what is a true statement about the change in temperature and heat transferred during 1-2?
A.  $\Delta $T > 0, Q > 0
B.  $\Delta $T < 0, Q = 0 
C.  $\Delta $T = 0, Q = 0 
D.  $\Delta $T > 0, Q < 0 
E.  $\Delta $T = 0, Q < 0

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
An ideal gas is taken from state 1 to state 2 and then to state 3.  <image 1>If the process 1-2 is adiabatic and 2-3 is isothermal, what is a true statement about the change in temperature and heat transferred during 1-2?
A.  $\Delta $T > 0, Q > 0
B.  $\Delta $T < 0, Q = 0 
C.  $\Delta $T = 0, Q = 0 
D.  $\Delta $T > 0, Q < 0 
E.  $\Delta $T = 0, Q < 0

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