Correct answer: A). Thymus gland
The thymus is a lymphatic mass that is found in the lower part of the throat overlying the heart. It plays an important role in the development of a healthy immune system.
Actually, they generate mature T lymphocytes that help the immune system to fight against diseases. It shrinks with the age. It loses its function over time and becomes inactive during adulthood.
Hence, the correct answer would be option A.
