Shape selective catalysis is a process in which the shape and size of the catalyst play a crucial role in determining the selectivity and efficiency of the reaction. It is often used in the petrochemical industry for various reactions such as cracking and isomerization. Among the given options, zeolites are the best example of shape selective catalysis.

Zeolites:
- Zeolites are a type of porous crystalline materials that have a well-defined structure with uniform channels and cavities of molecular dimensions.
- The unique structure of zeolites allows them to selectively adsorb and catalyze certain molecules based on their size and shape.
- The pores in zeolites act as molecular sieves, allowing only molecules of specific sizes to enter and react within the catalyst framework.
- The size and shape of the zeolite pores can be tailored to match the size and shape of the desired reactant molecules, thereby achieving high selectivity in catalytic reactions.
- Zeolites have been widely used as catalysts in various industrial processes, including the conversion of alcohols to gasoline, the synthesis of petrochemicals, and the removal of pollutants from exhaust gases.

Other options:
- Finely divided nickel, palladium, and platinum are all examples of metal catalysts, but they do not exhibit shape selective catalysis.
- Metal catalysts typically rely on the surface properties and active sites of the metal particles for catalytic reactions, rather than shape selectivity.
- While metal catalysts can be highly effective in many reactions, they do not possess the same level of control over reactant selectivity as zeolites.

Conclusion:
Zeolites are the best example of shape selective catalysis due to their unique structure and ability to selectively adsorb and catalyze molecules based on their size and shape. They have found widespread applications in the petrochemical industry and other catalytic processes where high selectivity is desired.