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Drug X becomes ineffective after 50% decomposition. The original concentration of drug in a bottle was 16 mg/mL which becomes 4 mg/mL in 12 months. The exp iry time of the drug in months is _____. Assume that the decomposition of the drug follows first order kinetics.

1. 12
2. 2
3. 3
4. 6

Correct answer: 6

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