单项选择题

A.胃气囊充气量为300~400ml,食管充气量为200~300ml
B.胃气囊充气量为50~100ml,食管充气量为100~150ml
C.胃气囊充气量为100~150ml,食管充气量为150~200ml
D.胃气囊充气量为150~200ml,食管充气量为100~150ml
E.胃气囊充气量为200~300ml,食管充气量为150~200ml