我是五年級的老人，以前國中時，很流行考一種文法題
He is ___________.
(A) Chinese (B) a Chinese
楊榮一和其他參考書公布的答案都是B.
考上了建中，高二的英文老師據說是師大英語系第一名畢業，
他上課時主動提起這題，說A也對。
最近聽到外國人說A才對，B很罕見，不能算是對的選項。
Wiktionary usage note:
As with all nouns formed from -ese, the countable singular form ("I am a
Chinese") is uncommon and often taken as incorrect, although it is rather
frequent in East Asia as a translation for the demonyms written 中国人 in
Chinese characters or Japanese kanji.
可參閱http://goo.gl/V8DJ8d
https://www.englishforums.com/English/IAmAChinese/bkgcrr/post.htm