The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 10-year-old boy is brought to his pediatrician after discovering a painless mass in the left testicle. Results from tumor markers and a biopsy are as follows: AFP 350 ng/mL (normal value < 10 ng/mL) hCG 0.4 IU/L (normal value < 0.5 IU/L) Biopsy: Presence of glomeruli-like structures with a central capillary within a mesodermal core, lined by flattened layers of germ cells. What is the most likely diagnosis in this patient?   (A) Classic seminoma   (B) Choriocarcinoma   (C) Teratoma   (D) Yolk sac tumor
['(D) Yolk sac tumor <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Classic seminoma \n (B) Choriocarcinoma \n (C) Teratoma \n (D) Yolk sac tumor <> possible answers', '  A 10-year-old boy is brought to his pediatrician after discovering a painless mass in the left testicle. Results from tumor markers and a biopsy are as follows:\nAFP 350 ng/mL (normal value < 10 ng/mL)\nhCG 0.4 IU/L (normal value < 0.5 IU/L)\nBiopsy: Presence of glomeruli-like structures with a central capillary within a mesodermal core, lined by flattened layers of germ cells.\nWhat is the most likely diagnosis in this patient? <> context@']