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In a fetus, where are lymphocytes produced?

  • A.In the spleen
  • B.In the bone marrow
  • C.In the liver
  • D.In the heart

Answer: C

Correct answer: In the liver

Haematopoiesis moves about during development: it begins in the yolk sac, and through most of gestation the fetal liver is the main site, with the spleen contributing. Only towards the end does the bone marrow take over, and it remains the site for life.

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