What is the parent chain of the following compound? 
Definitions:
Fetal Exposure
Refers to the exposure of a fetus to substances, conditions, or influences in the womb that can affect development.
Neural Tube
The precursor to the central nervous system in vertebrates, which later develops into the brain and spinal cord during embryonic growth.
Nervous System
The complex network of nerve cells and fibers that transmits nerve impulses between parts of the body, governing both voluntary actions like walking and involuntary ones like breathing.
Embryo
An early stage of development for multicellular organisms following fertilization, during which the organism undergoes division and growth.
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