The correct answer is option 4- plasma. Lymph is a tissue fluid that is present in the intercellular spaces of the body. It is similar in composition to plasma, the fluid component of blood.

Plasma is a yellowish fluid that makes up about 55% of the total blood volume and contains water, proteins, electrolytes, hormones, and waste products. It circulates throughout the body, delivering nutrients and oxygen to the cells and removing waste products.

Similarly, lymph is a clear fluid that is formed from excess fluid and waste products that are filtered out of the blood capillaries. It also contains proteins, electrolytes, and immune cells. Lymph circulates through the lymphatic vessels and eventually drains back into the bloodstream.

Option 1, digestive juice, is incorrect as digestive juices are secreted by the digestive glands and are involved in the breakdown and absorption of nutrients in the digestive system.

Option 2, cytoplasmic fluid, is incorrect as cytoplasmic fluid refers to the fluid that fills the inside of living cells, while lymph is present in the intercellular spaces.

Option 3, urine, is incorrect as urine is the waste product excreted by the kidneys and contains metabolic waste products dissolved in water