Lymph's aqueous nature with immune factors

Steps:

• Identify lymph as a clear fluid derived from tissue fluid, similar to plasma but filtered.
• Confirm water as the main solvent in lymph, comprising over 90% of its volume.
• Note antibodies (immunoglobulins) are present in lymph to transport immune defenses.
• Verify lipids are generally absent in lymph, unlike chyle from intestinal absorption.

Why A is correct:

• Lymph is defined as a watery ultrafiltrate of plasma containing antibodies for immunity but lacking lipids in standard composition.

Why the others are wrong:

• B: Water is present, not absent, as lymph is primarily aqueous.
• C: Antibodies are present, not absent, enabling immune surveillance.
• D: Water and antibodies are both present, not absent.

Final answer: A