Take the following as truth: Thus we now have the big A as well as the A-word and the M-question as well as the M-word .  Perhaps we shall see such forms as the little A , the new A , or the A-option . If these variants prove productive, the lexicon of one-letter words could  spread like wild flowers,  as Sam Goldwyn once said.
Then the following statement: "There are no one-letter words in our lexicon" is true, false, or inconclusive?
Answer: False