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 recent study of inflationary expectations has revealed that the consensus among economic forecasters yields the following average annual rates of inflation expected over the periods noted. (Note: Assume that the risk that future interest rate movements will affect longer maturities more than shorter maturities is zero; that is, assume that there is no maturity risk.) <image 1> If the real rate of interest is currently 2.5%, find the nominal rate of interest on the following U.S. Treasury issues: 3-month bill
A. 7.5%
B. 8.5%
C. 10.5%
D. 11.5%

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
A recent study of inflationary expectations has revealed that the consensus among economic forecasters yields the following average annual rates of inflation expected over the periods noted. (Note: Assume that the risk that future interest rate movements will affect longer maturities more than shorter maturities is zero; that is, assume that there is no maturity risk.) <image 1> If the real rate of interest is currently 2.5%, find the nominal rate of interest on the following U.S. Treasury issues: 3-month bill
A. 7.5%
B. 8.5%
C. 10.5%
D. 11.5%

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