This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
16F circumference of a catheter means 
Select and explain. 
A. 4.8 mm, B. 2.8 mm, C. 8.4 mm, D. 8.2 mm
A: 4.8 mm
Answer: A: 4.8 mm 
Explanation: Ans. a (4.8 mm). (Ref. B & L, Surgery, 23rd ed., 1262)3.12 SF = 1mm, hence a 16F Circumference of catheter means (r)