What is the primary source of hematopoietic stem cells in adult humans?

A Bone marrow ✓
B Peripheral blood
C Spleen
D Liver

Explanation

In adult humans, the bone marrow is the primary site of hematopoiesis, and it is the main source of hematopoietic stem cells.

Source

Robbins and Cotran Pathologic Basis of Disease
Hematology Hematology: Hematopoiesis Hematology: Hematopoiesis Easy MEDICAL Confidence: high