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The correct choice for measuring 4ml of Dilantin Suspension is the oral dropper. An oral dropper is specifically designed for accurately measuring small volumes of liquid medications. It typically has a calibrated scale, allowing for precise dosing, which is crucial when administering medications like Dilantin that require exact dosages to ensure safety and effectiveness.

While a medication cup can also be used to measure liquids, it is generally more suited for larger volumes and may not offer the same level of accuracy for smaller measurements like 4ml. A teaspoon, although commonly used in home settings, is not a standardized measure and might lead to variations in dosing. Lastly, a graduated cylinder, while also accurate, is typically used in laboratory settings for larger volumes and might not be practical for administering medications in a clinical or home environment.

Thus, the oral dropper is the most appropriate device for measuring 4ml of Dilantin Suspension.