Which of the following molecules contain(s) a nitrogen atom that has trigonal pyramidal molecular geometry? 
Definitions:
Central Axis
The core line running through an object or body, around which it is symmetrically arranged.
Rebound Tenderness
A clinical sign indicative of peritonitis, where pain is felt upon the quick release of deep pressure from the abdomen.
Percuss
In the medical context, "percuss" refers to the act of tapping on a surface, typically the body, to diagnose the condition of the underlying tissues or organs.
Palpate
To examine or explore by touching (an organ or area of the body), usually as a diagnostic aid.
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