Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: How many degrees of freedom does a Student's t-test applied to two samples related to a total of 25 individuals?
Options: <1> 26 <2> 24 <3> 2. 3. <4> 48 <5> 47
Output:
2