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 table below shows the number of patients who developed an infection while in hospital as well as those who remained infection free. The results from two different hospitals over the same time period are displayed.If we wanted to compare the proportion of patients who developed an infection between the two hospitals then which of the following statistical tests should we use (select the best answer)? <image 1> 
A. Independent samples t test
B. Fisher's Exact test 
C. Kappa 
D. McNemar's test

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
The table below shows the number of patients who developed an infection while in hospital as well as those who remained infection free. The results from two different hospitals over the same time period are displayed.If we wanted to compare the proportion of patients who developed an infection between the two hospitals then which of the following statistical tests should we use (select the best answer)? <image 1> 
A. Independent samples t test
B. Fisher's Exact test 
C. Kappa 
D. McNemar's test

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