Chapter 2, Problem 8RA

Lecithin is

$\begin{array}{l}\text{a}\text{. a carbohydrate}\text{.}\hfill \\ \text{b}\text{. a protein}\text{.}\hfill \\ \text{c}\text{. a steroid}\text{.}\hfill \\ \text{d}\text{. a phospholipid}\text{.}\hfill \end{array}$