【名词&注释】
肺动脉瓣狭窄(pulmonary valve stenosis)、肺动脉狭窄(pulmonary stenosis)、肺动脉主干(pulmonary artery trunk)、右肺动脉(right pulmonary artery)、左肺动脉(left pulmonary artery)
[单选题]法洛四联症肺动脉狭窄的最常见的部位是:
A. 肺动脉瓣狭窄
B. 漏斗部狭窄
C. 肺动脉主干狭窄
D. 左肺动脉(left pulmonary artery)狭窄
E. 右肺动脉狭窄