Why Are Visual Disturbances Caused by a Pituitary Adenoma

Why are visual disturbances caused by a pituitary adenoma?

A) Because of liberation of anterior pituitary hormones into the optic chiasm,which is adjacent to the pituitary gland
B) Because of pituitary hormones clouding the lens of the eyes so that light cannot pass through to the retina
C) Because of the pressure of the tumor on the optic chiasm,which is adjacent to the pituitary gland
D) Because of the pressure of the tumor on the optic (CN I) and oculomotor (CN III) cranial nerves that alters their functions

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