Which of the following glands is large-sized at birth but reduces in size
with ageing?
a. Pineal
b. Pituitary
c. Thymus
d. Thyroid
The answer is the option (c) Thymus
At birth, the thymus is relatively large, but it progressively shrinks as a person ages, a process called involution. In adulthood, the thymus becomes much smaller and is largely replaced by fatty tissue, although it continues to contribute to immune function during early life.