Instructions Full Game: These are multiple-choice quizzes with four possible answer choices that include all questions in a given set.     
What part of the body fits the following description?
A small endocrine gland in the brain. Produces melatonin, a serotonin-derived hormone which modulates sleep patterns in both circadian and seasonal cycles. The shape of the gland resembles a pine cone. Also called the conarium, or epiphysis cerebri.
thalamus
pineal gland
pituitary gland
hypothalamus