53.承上題，何種簡單檢查，即可做診斷？ A.口服水溶劑對比劑檢查（oral water soluble contrast medium study） B.內視鏡檢查 C.腹部超音波 D.胸部X光檢查
Parser adapted from Manning, Christopher D., et al. "The stanford corenlp natural language processing toolkit." 2014.
Visualisation provided using the brat visualisation/annotation software.