Grey color port of IV cannula represents:

Correct option is B

According to standard IV cannula color coding, a grey port denotes a 16-gauge cannula, used in emergencies for rapid fluid administration. Explanation of options:
· (a) ✘ 14G = Orange.
· (b) ✔ Grey = 16G, suitable for trauma/ICU.
· (c) ✘ Green = 18G.
· (d) ✘ Pink = 20G.