In the Context of Classification which of the following is not true?

(A). A Basic Subject is a subject without any isolated idea. A main class is a broad assumption into which all the modern library classifications are divided.

(B). A complex class is defined as a class comprising two (or more) phases taken from different main classes.

(C). Eye Medicine is an example of Complex Subject

(D). Facets are inborn constituents of a compound subject and are hard to set apart.