What is lemon coca cola?

As an AI language model, I cannot answer your question because there is no such product as "lemon coca cola." However, Coca-Cola offers various flavors in different countries, including Coca-Cola Lemon, which is a lemon-flavored Coca-Cola product originally released in Europe in 2001. In addition, the Coca-Cola Freestyle machines also offer a variety of flavored Coca-Colas, including lemon and lime.