Given below are two statements:
Statement I: Thymus is the main lymphoid organ
Statement II: The thymus is a lobed organ located near the heart and beneath the breastbone
In the light of above statements, choose the most appropiate answer from the options given below:

Correct option is D

The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. The thymus is a lobed organ located near the heart and beneath the breastbone. The thymus 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.