Correct

骨髓

/ gǔsuǐ / 
Strokes

Definition

bone marrow (medulla ossea)

Example

As a Noun

bone marrow

1
Juānxiàn
捐献
gǔsuǐ
骨髓

donate marrow

2
Chōu
抽
gǔsuǐ
骨髓

draw marrow