Update README.md

README.md

@@ -60,7 +60,7 @@ The dataset contains four splits:
   - **op4_test**: four-option multiple-choice QA (choices A-D)
   - **op5_test**: five-option multiple-choice QA (choices A-E)
 
-`op5` splits contain the same content as `op4` splits, but with one additional answer choice to increase difficulty. Note that while the content is the same, the letter choice corresponding to the correct answer is sometimes different between these splits.
+`op5_test` contains the same content as `op4_test`, but with one additional answer choice to increase difficulty. Note that while the content is the same, the letter choice corresponding to the correct answer is sometimes different between these splits.
 
 ### Dataset Sources