Question

jillian is a new mother. the first time she nursed her baby she instantly bonded. this is most likely caused by the release of:
oxytocin.
adrenaline.
serotonin.
estrogen.

Explanation:

Oxytocin is known as the "love hormone" or "bonding hormone". It is released during breastfeeding and helps in creating a strong emotional bond between mother and baby. Adrenaline is associated with the fight - or - flight response, serotonin is related to mood regulation, and estrogen is a sex hormone mainly involved in female reproductive functions and secondary sexual characteristics.

Answer:

A. oxytocin