Officially going insane. Which of the following removes phosphate functional groups from proteins

Which of the following removes phosphate functional groups from proteins?

a. protein kinase
b. protein phosphatase
c. phosphodiesterase
d. phosphorylase
e. GTPase

THE CORRECT ANSWER IS the option after the first one (Not to spoil the answer for you.)

GTPase converts GTP to GDP, what the hell? -______-

Okay, lets run by these to make sure you understand the concept.

A. Kinases add phosphates so that cannot be it
B. Protein phosphatases remove phosphates specifically from protein so that is correct
C. Phophodiesterase breaks phosphodiester bonds so that is not it
D. Phosphorylase also adds phosphates so that is not it

E. GTPase does remove phosphate bonds but GTP is NOT a protein. Your question specifically asks for removal of phosphate from proteins so this cannot be it either.

Thus, B is your answer.