How to detect the entity type with mcreator.

How to detect the type of entity, (for example how to differentiate an enderman, form a skeletons or any other entity) with mcreator.

Setting the scene: 
I would like the Enderman and only the Enderman is some probability to drop a special ender pearl.
 
Problem:
I don't know how to tell the difference between a specific type of creature (on MCcreator) 

Which has already been done: 
I know how to make an event with certain probability, I also know how to make the item appear. But I don't know how to differentiate between a specific type of creature (on MCcreator), detect that the entity killing is an Enderman and not another entity. 

I did some research and I think I found a solution. This solution is to use the tags, thanks to this solution I found how to detect the entity of type "minecraft:skeletons" but I still do not know how to detect the entity of type Enderman.  

I hope you could help me, thank you in advance for the help and in any case thank you for answering me.