The major histocompatibility complex is a :

The cell-mediated immunity inside the human body is carried out by 

1. T-lymphocytes

2. B-lymphocytes

3. thrombocytes

4. erythrocytes

The letter T in T-lymphocyte refers to

1. thyroid

2. thalamus

3. tonsil

4. thymus

The most active phagocytic white blood cells are

1. neutrophils and eosinophils

2. lymphocytes and macrophages

3. eosinophils and lymphocytes

4. neutrophils and monocytes

Hybridoma is a synonym of: