Update README.md

README.md

@@ -40,6 +40,7 @@ The code used to extract the data is from [https://github.com/esther2000/exam-mc
 
 We filtered the questions manually to only contain Multiple Choice Questions and maximum 4 options, we did *not* alter the question itself.
 
+**Note that the answer does not refer to the index, but the actual number of the option, e.g., 1->A 2->B 3->C 4->D**
 
 <h2>Copyright</h2>