Which of the following needles has the widest lumen?

A #21 gauge needle has a smaller diameter than a #19 gauge needle, making it a not an appropriate choice for the widest lumen. A #23 gauge needle is even smaller than a #21 gauge and again, not the correct choice for the widest lumen. A #18 gauge needle is larger than a #19 gauge, but it is not the largest of the options given, making it an incorrect choice. The correct answer, #19 gauge, has the widest lumen out of the four options provided.