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Chloramphenicol is a synthetic antibiotic that contains distinct chemical elements found in its molecular structure. The correct elements that make up Chloramphenicol are associated with chlorine and ammonia. In the context of its chemical composition, chlorine (from the halogen group) contributes to the structure, while ammonia (which is a compound made of nitrogen and hydrogen) provides key functional groups essential to the antibiotic's activity.

This combination reflects the incorporation of a chlorine atom, which is crucial for its biological function, and nitrogen from the ammonia, which is part of the amine group present in the chloramphenicol structure. Understanding the correct elements involved is fundamental in recognizing how the antibiotic operates and its relevance in medical applications.

The other options do not accurately represent the chemical composition of Chloramphenicol. Chlorine pairs with elements other than those listed in the incorrect choices do not correspond to the molecular mechanism or structure of the drug. Knowing the specific elements aids in grasping the broader concepts of medicinal chemistry and the role of various compounds in pharmacology.