Select the option that correctly identifies the labels A,B, C and D in the given diagram.
A. `{:(A,B,C,D),("Anterior pituitary","Posterior","Blood vessel","Thalamus"):}`
B. `{:(A,B,C,D),("Posterior pituitary","Anterior pituitary","Hypothalmus","Thalamus"):}`
C. `{:(A,B,C,D),("Anterior pituitary","Poseterior pituitary","Portal circulation","Hypothalamic neurons")):}`
D. `{:(A,B,C,D),("Hypothalamic neurons","Poseterior pituitary","Anterior pituitary","circulation"):}`
