Question

Which philosopher holds that "happiness is desirable and the only thing desirable as an end; all other things being only desirable as a means to that end?"?

Answer 1

The correct answer is John Stuart Mill. 
He was a famous British philosopher who lived during the 19th century. He was a major proponent of utilitarianism, which is an idea that everything we do is supposed to help the society around us. According to him, even happiness is a utilitarian though, meant to help the world. 

Answer 2

John Stuart Mill is a philosopher who holds that "Happiness is desirable and the only thing desirable as an end; all other things being only desirable as a means to that end?"