What are lipoproteins?

Following are the statements with reference to 'lipids'.
(a) Lipids having only single bonds are called unsaturated fatty acids.
(b) Lecithin is a phospholipid.
(c) Trihydroxy propane is glycerol.
(d) Palmitic acid has $20$ carbon atoms including carboxyl carbon.
(e) Arachidonic acid has $16$ carbon atoms.

Choose the correct answer from the options given below.

Select the correct option for the below structure with its occurrence.

Which one of the following structural formulae of two organic compounds is correctly identified along with
its related function?  

Identify the molecules (a) and (b) shown below, and select the right option giving their name and occurrence:
 (a)
 (b)