The correct answer is B. Bone marrow.
Lymphocytes are a type of white blood cell that play a vital role in the immune system. They are produced in the bone marrow, which is a spongy tissue found inside bones. Bone marrow is also responsible for producing other types of blood cells, such as red blood cells and platelets.
The liver is an organ that is located in the upper right abdomen. It is responsible for many important functions in the body, including the production of bile, the metabolism of carbohydrates, proteins, and fats, and the storage of vitamins and minerals. The liver does not produce lymphocytes.
The pancreas is an organ that is located in the upper abdomen, behind the stomach. It is responsible for the production of digestive enzymes and hormones, such as insulin. The pancreas does not produce lymphocytes.
The spleen is an organ that is located in the upper left abdomen. It is responsible for the removal of old red blood cells from the bloodstream, the production of lymphocytes, and the storage of blood. The spleen is not the primary site of lymphocyte production.
In conclusion, the correct answer to the question “In human body lymphocytes are formed in” is B. Bone marrow.