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