Read the following Assertion and Reason and choose the correct option. Assertion: The thymus is a primary lymphoid organ involved in the maturation of T-lymphocytes. Reason: The thymus continues to grow throughout life and does not change in size after birth.

Step-by-step solution

In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant. Benign tumors normally remain con