Tajweed Quiz: Who are the only 2 people they say that could pronounce ض perfectly?

When you learn Arabic/Tajweed you know that Arabic is known as the "language of ض."

(daad) ض needs to be pronounced with both sides of the tongue equally. They say only two people could perfectly pronounce ض . Who are these two people?
I didn't get any correct answers last time. All I got was a headache from one moron ranting.
 
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