Question: Who originally discovered these parts of the immune system?
Answer: When health conditions worsen to emergency status, portions of immune system organs including the thymus, spleen, bone marrow, lymph nodes and other lymphatic tissues can be surgically excised for examination while patients are still alive.
A single-select problem: Is the question answered in a satisfactory fashion?

pick from the following.
(A). yes.
(B). no.
(B).