Refer to the periodic table, and decide which of the following molecules is held together by polar covalent bonds. 
Definitions:
Oral Cholecystogram
A diagnostic imaging test used to examine the gallbladder by oral ingestion of a radiopaque dye that is excreted into the bile.
Gallbladder Series
A series of diagnostic tests, including ultrasound and sometimes oral cholecystography, used to assess the health and function of the gallbladder.
Abdominopelvic Cavity
The body cavity extending from the abdominal area to the pelvic floor, housing major organs of the digestive, reproductive, and urinary systems.
Aneurysms
Abnormal bulges in the wall of a blood vessel, which can potentially rupture, leading to dangerous hemorrhaging.
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