18.氣管分岔處（carina）在胸部 X 光所在的高度約相應於脊椎那一個部位？ A.C6 B.T1-2 C.T4-5 D.L2-3
Parser adapted from Manning, Christopher D., et al. "The stanford corenlp natural language processing toolkit." 2014.
Visualisation provided using the brat visualisation/annotation software.