Which of the following structures is a branched-chain hydrocarbon? 
Definitions:
Unwanted Pregnancy
A pregnancy that occurs without the intention or desire of one or both participating individuals.
Birth Process
The sequence of physiological and psychological events that lead to the delivery of a baby.
Second Stage
In the context of labor and delivery, it refers to the period of childbirth when the mother pushes and leads to the delivery of the baby.
Amniotic Sac
A fluid-filled sac that surrounds and protects the embryo and fetus in the uterus.
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