A 20 year female presents with a ovarian mass 6x 6 x 6cm in size. Ultrasonography reveals solid structures in the mass. Her serum biomarkers such as AFP. fO-hCG and CA 125 are normal, however, her serum alkaline phosphatase was found to be elevated. The most likely diagnosis is
Dysgerminoma Endodermal sinus tumor Malignant teratoma Mucinous cystadenocarcinoma