Step 1: Understanding the role of Oxytocin.
Oxytocin is commonly known as the "love hormone" because it plays a crucial role in social bonding, emotional responses, and reproduction. It is released during childbirth and breastfeeding, fostering maternal behaviors, as well as during emotional moments like hugging or bonding with loved ones.
Step 2: Analyzing the options.
(1) Adrenaline: Incorrect, adrenaline is a "fight or flight" hormone, not associated with love.
(2) Oxytocin: Correct — Oxytocin is known as the "love hormone."
(3) Progesterone: Incorrect, progesterone is primarily involved in the menstrual cycle and pregnancy, not love.
(4) Testosterone: Incorrect, testosterone is linked to sex drive and muscle growth, not love.
Step 3: Conclusion.
The correct answer is (2) Oxytocin.