In ‘T-lymphocytes’, the letter ‘T’ refers to
Thalamus
Tonsil
Thymus
Thyroid
As we have already studied in Cell-Mediated Immune System -
The letter ‘T’ in ‘T-lymphocytes’ refers to Thymus. These immature lymphocytes originate in the bone - marrow. Then, these lymphocytes migrate through the blood to the thymus. Once these cells enter into thymus are called mature T - Lymphocytes’. Hence, the correct option is (c).