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: Anatomy
Hydatidiform-mole, blood cells does NOT develop because defect in 
Select and explain. 
A. Primary ectoderm, B. Mesoderm, C. Endoderm, D. Trophoblast
B: Mesoderm
Answer: B: Mesoderm 
Explanation: B. i.e. MesodermWhole cardiovascular system i.e. hea, bloodvessels, lymphatic & blood cellsQ are mesodermal in origin