Given a paragraph, your job is to generate a question that can be answered from the passage. The answer to your question should be a single entity, person, time, etc. that can be extracted from the passage.

The historian Frederick W. Mote wrote that the usage of the term 'social classes' for this system was misleading and that the position of people within the four-class system was not an indication of their actual social power and wealth, but just entailed 'degrees of privilege' to which they were entitled institutionally and legally, so a person's standing within the classes was not a guarantee of their standing, since there were rich and well socially standing Chinese while there were less rich Mongol and Semu than there were Mongol and Semu who lived in poverty and were ill treated.
Who thought that the Yuan's social class system shouldn't be called social classes?