<prompt> Following tumour produce a marked elevation of:Alpha feto proteinPlacental alkaline phosphataseHuman placental lactogenCA 125  <response>: Yolk sac tumors are those that resemble the yolk sac, allantois, and extraembryonic, mesenchyme. They are also known as endodermal sinus tumors. Yolk sac tumors can be seen in males and females, involving the testis, ovary, and other sites, such as themediastinum. Pure yolk sac tumor is the most common testicular neoplasm in prepubertal children. Almost all the patients with a yolk sac tumor either in pare form or mixed form have a significantly elevated serumAlpha fetoprotein AFP. 