A. Spleen
A.
B. Liver
B.
C. Bone marrow
C.
D. Heart
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
While in adults, red blood cells are produced primarily in the bone marrow, in a fetus, the liver is the main site of red blood cell production during early development. The spleen also plays a role in red blood cell production in the fetus, but to a lesser extent. The yolk sac is the initial site of blood cell production in the embryo.