text: The<unk> s are small endocrine<unk> s in the neck, usually located behind the thyroid<unk> , which produce<unk>  hormone.  In rare cases the<unk> s are located within the thyroid<unk> s. Most often there are four<unk> s, but some people have six or even eight.
option_0: Parathyroid gland
option_1: Thyroid gland
option_2: Adrenal cortex
option_3: Thyroid isthmus
option_4: Mammary gland
option_5: Lingual thyroid
option_6: Breast
option_7: Renal corpuscle