This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Bart's hydrops fetalis is lethal because – 
Select and explain. 
A. Hb Bart's cannot bind oxygen, B. The excess a – globin form insoluble precipitates, C. Hb Bart's cannot release oxygen to fetal tissues, D. Microcytic red cells become trapped in the placental
C: Hb Bart's cannot release oxygen to fetal tissues
Answer: C: Hb Bart's cannot release oxygen to fetal tissues 
Explanation: `In the foetus excess, gamma globin chains form tetramers (1Ib Barts) with such high affinity for oxygen that they deliver almost no oxygen to tissues' - Robbins

Clinically this condition manifests as hydrops fetalis and fetus shows features similar to those of erythroblastosis fetalis → Severe pallor, Generalized edema, Massive hepatosplenomegaly