Whether substances are medicines or poisons often depends on dosage, for substances that are curative in small doses can be toxic in large (Option C).
Sentence completions test the skill to use the information observed in complex and incomplete sentences in order to correctly complete them.
It tests a candidate's vocabulary power and skill to follow the logic of sentences.
Now,
Hence, Option C is the most accurate, i.e., Whether substances are medicines or poisons often depends on dosage, for substances that are curative in small doses can be toxic in large (Option C).
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