Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'hematopoietic or lymphoid organ development'?

A. The process whose specific outcome is the progression of a gland over time, from its formation to the mature structure. A gland is an organ specialised for secretion.
B. The process whose specific outcome is the progression of any organ involved in hematopoiesis (also known as hemopoiesis) or lymphoid cell activation over time, from its formation to the mature structure. Such development includes differentiation of resident cell types (stromal cells) and of migratory cell types dependent on the unique microenvironment afforded by the organ for their proper differentiation.
C. The process whose specific outcome is the progression of the urinary bladder over time, from its formation to the mature structure. The urinary bladder is an elastic, muscular sac situated in the anterior part of the pelvic cavity in which urine collects before excretion.
D. The process whose specific outcome is the progression of sensory organs over time, from its formation to the mature structure.

Answer: The process whose specific outcome is the progression of any organ involved in hematopoiesis (also known as hemopoiesis) or lymphoid cell activation over time, from its formation to the mature structure. Such development includes differentiation of resident cell types (stromal cells) and of migratory cell types dependent on the unique microenvironment afforded by the organ for their proper differentiation.