The _________1_____________ is the main lymphoid organ where all blood cells _________2_____________ lymphocytes are produced. The _________3_____________ is a lobed organ located near the heart and beneath the breastbone. The _________3_____________ is quite large at the time of birth but keeps reducing in size with age and by the time puberty is attained it reduces to a very small size. Both _________1_____________ and _________3_____________ provide micro-environments for the development and maturation of T-lymphocytes.

Options

A. `{:("(1)","(2)","(3)"),("bone marrow","including","thymus"):}`
B. `{:("(1)","(2)","(3)"),("spleen","including","thymus"):}`
C. `{:("(1)","(2)","(3)"),("thymus","excluding","bone marrow"):}`
D. `{:("(1)","(2)","(3)"),("bone marrow","excluding","spleen"):}`

Answer

A