Concept:
Different electromagnetic waves have specific applications.
Step 1: Check each pair carefully.
• (A) Microwaves → used in radar/navigation → correct
• (B) Radio waves → used in communication → correct
• (C) Infrared → used in remote controls → correct
• (D) UV → used in LASIK surgery → correct
Step 2: Analyse incorrect pair.
Klystron is a microwave generating device, not related to gamma rays.
Step 3: Conclusion.
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\boxed{(E)}
\]