Transplantation of tissues/organs to save certain patients often fails due to rejection of such tissues/organs by the patient. Which type of immune response is responsible for such rejections?
1. Auto-immune response
2. Humoral immune response
3. Physiological immune response
4. Cell-mediated immune response
Which of the following is not a lymphoid tissue?
1. Spleen
2. Tonsils
3. Pancreas
4. Thymus
Which of the following glands is large-sized at birth but reduces in size with ageing?
1. Pineal
2. Pituitary
3. Thymus
4. Thyroid