Explanation

The dissimilar pair in the list is "Radio and Transistor".

All the other pairs consist of an object and the substance or item associated with it:

1. Glass contains milk.
2. Bottle holds drink.
3. Pen uses ink.

However, "Radio" is a device, while "Transistor" is a component of a radio.

The other pairs have a direct association between the two items,

whereas in "Radio and Transistor," one is the device itself, and the other is a component of that device.

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