Choose the odd one out from the following terms and name the category to which the others belong:
Growth Hormone, Vasopressin, Thyroid Stimulating Hormone, Gonadotropic Hormone
Topic: Anterior pituitary hormones
Answer
Odd one out: VASOPRESSIN. Category of the others: HORMONES SECRETED BY THE ANTERIOR LOBE OF THE PITUITARY GLAND.
All four are pituitary hormones, so the division is finer than "pituitary or not" — it is WHICH LOBE.
ANTERIOR lobe: Growth Hormone, Thyroid Stimulating Hormone, Gonadotropic Hormone (FSH and LH), and also ACTH and prolactin. POSTERIOR lobe: VASOPRESSIN (antidiuretic hormone) and OXYTOCIN — only these two.
So vasopressin is the odd one.
THE SHORTCUT: the posterior pituitary releases just TWO hormones, ADH and oxytocin. Learn that pair, and anything else named as a pituitary hormone must be anterior. It is far easier than memorising the longer anterior list.
Note also that the posterior lobe does not actually MAKE its two hormones — they are produced in the hypothalamus and merely stored and released here.