Is that CART? Why not using C5.0 tree?
A perhaps more general question:
Since C5.0 tree frequently have better performance than CART, why people still use CART to build random forest (or people already are doing this)?
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My experience is with sklearn and python.
A Random Forest is a bagging of decision trees, the sklearn package uses a Decision Tree Classifier which is a CART.
You can see in this post that I made a bit ago of how to build a Random Forest tree the exact same as a decision tree.