Who defined "Surrealist" as "pure psychic automatism by which it is intended to express, either verbally or in writing, the true function of thought. Thought dictated in the absence of all control exerted by reason, and outside all aesthetic or moral preoccupations"?

a. André Breton
b. Gustave Caillebotte
c. Gustave Moreau
d. Sigmund Freud

a