Which of the numbered features is a lava flow? 
Definitions:
Sterile Technique
Practices used in healthcare and laboratory settings to prevent contamination by microbes, including the use of sterilized equipment and aseptic procedures.
Electrocautery
An apparatus used to cauterize tissue with heat from a current of electricity.
Needle Biopsy
A procedure where a small sample of tissue is taken from the body using a thin needle for examination, often to diagnose diseases like cancer.
Aspiration
The act of inhaling a foreign object or substance into the airway or lungs, or a strong desire or ambition for achievement.
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