This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Beta thalasemmia, Subject name: Pathology
A child died soon after bih. On examination, there was hepatosplenomegaly and oedema all over the body. Most probable diagnosis is - 
Select and explain. 
A. Beta Thalassemia, B. Alpha Thalassemia, C. Hereditary spherocytosis, D. Sickle cell anemia
B: Alpha Thalassemia
Answer: B: Alpha Thalassemia 
Explanation: - Features given in the question suggests the diagnosis of Hydrops fetalis. - Out of all the four types of hemolytic anemias only severe form of alpha thalassemia caused d/t deletion of all 4 alpha globin chains, have such severe presentation at bih. - In all other conditions the newborn is either normal or has mild jaundice.