A newborn has congenital heart failure,which is not improving on treatment.He has bulging anterior fontanelles with a bruit on auscultation.On trans fontanelle USG a hypoechoeic midline mass is seen with dilated lateral ventricles .Most probable diagnosis is

• A. Vein of Galen malformation
• B. Arachnoid cyst
• C. Medulloblastoma
• D. Encephalocele