Which nerve passes through the quadrilateral foramen （）.

A．the femoral vein, artery, and nerve lie in the femoral sheath.
B．the femoral nerve lies most medially in the femoral triangle.
C．the lateral border of the femoral triangle is formed by the lateral border of sartorius muscle
D．the femoral canal lies medial to the femoral vein.
E．at the apex of the femoral triangle, the femoral vessels pass into the popliteal fossa.

A．is a branch of the femoral a.
B．begins at level of the lower border of the popliteus
C．passes through the adduct canal.
D．accompanies the tibial nerve.
E．is palpable in the foot.