Emily suffers from insomnia. When she went to see a doctor, she was told that her sleeplessness was caused by the deficiency of a particular hormone. The doctor then gave her sleeping pills containing the deficient hormone. Emily has _______ deficiency.

A) melatonin
B) thyroxin
C) vasopressin
D) oxytocin

Melatonin Deficiency

A condition characterized by low levels of melatonin, a hormone that regulates sleep-wake cycles, leading to sleep disturbances.

Insomnia

A sleep disorder characterized by difficulty falling and/or staying asleep, affecting physical and mental health.

Hormone

A chemical substance produced in the body that controls and regulates the activity of certain cells or organs, essential for various bodily functions.