Concept:
Technopolis refers to a region with a concentration of high-technology industries, research institutions, and innovation. Silicon Valley and Silicon Forest are classic examples. High-tech industries employ a large proportion of white-collar professionals, but this fact does not explain why these regions are classified as Technopolis.
Step 1: Evaluate Assertion (A).
Silicon Valley and Silicon Forest are well-known Technopolis regions.
\[
\boxed{\text{Assertion (A) is True}}
\]
Step 2: Evaluate Reason (R).
High-technology industries indeed have a large proportion of white-collar workers.
\[
\boxed{\text{Reason (R) is True}}
\]
Step 3: Relation between A and R.
The reason is true but does not explain why Silicon Valley and Silicon Forest are Technopolis.
\[
\boxed{\text{(B)}}
\]