text: <unk>  is an overgrowth of carotid<unk>  organ. This organ functions to regulate the blood oxygen level.
option_0: Carotid body tumor
option_1: Vestibular tumor
option_2: Acoustic neuroma
option_3: Carotid artery stenosis
option_4: Aponeurosis
option_5: Vertebral artery disease
option_6: Glomus tumor
option_7: Craniopharyngioma