The therapeutic index (TI) of a drug is:

A Its cost

B The ratio of the toxic dose to the therapeutic dose (TD₅₀/ED₅₀)

C Its half-life

D Its bioavailability

✓ Correct Answer: Option B

TI = TD₅₀/ED₅₀ (or LD₅₀/ED₅₀). A higher TI means a wider margin of safety.

💡 Why is B) the correct answer?

The correct answer to the question "The therapeutic index (TI) of a drug is:" is Option B: The ratio of the toxic dose to the therapeutic dose (TD₅₀/ED₅₀).

The other options — A) Its cost, C) Its half-life, D) Its bioavailability — are incorrect for this English question. As explained above: TI = TD₅₀/ED₅₀ (or LD₅₀/ED₅₀). A higher TI means a wider margin of safety.

📚 About This English Practice Question

This 2-level English question from the Comprehension Passages topic is part of One Paper Preparation's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free English practice test or use flashcards for spaced repetition review.

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The therapeutic index (TI) of a drug is:

✓ Correct Answer: Option B

📚 About This English Practice Question

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