Step 1: Understanding complex lipids.
Complex lipids contain fatty acids, alcohols, and other molecules like phosphates or sugars. Lecithin, a phospholipid, is an example of a complex lipid. It contains both a glycerol backbone and a phosphate group.
Step 2: Analyzing the options.
(A) Testosterone: Incorrect. Testosterone is a steroid hormone, not a complex lipid.
(B) Lecithin: Correct — Lecithin is a complex lipid, specifically a phospholipid, that is important in biological membranes.
(C) Cholesterol: Incorrect. Cholesterol is a sterol, not a complex lipid.
(D) α - phellandrene: Incorrect. α - phellandrene is a terpenoid, not a lipid.
Step 3: Conclusion.
The correct answer is (B) Lecithin, which is a complex lipid.