The question asks which among the given options is exempted from importing into India without a license. Let's analyze each option:
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Insulin: Insulin is a hormone used to treat diabetes and is considered a controlled drug due to its importance in managing blood sugar levels. It is not exempt from import licenses.
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Etoposide: This is a chemotherapy medication used in the treatment of various cancers. Such medications are regulated and require import licenses to ensure quality and safety.
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Lactose: Lactose is a simple sugar found in milk. It is commonly used as an excipient in the pharmaceutical industry and as a food ingredient. Unlike medications, lactose does not pose the same level of risk when being imported and is generally exempted from requiring an import license.
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Glutethimide: This drug is a hypnotic sedative and, due to its potential for abuse and requirement for stringent control, it is not exempt from import licenses.
The correct answer is therefore Lactose, as it is the only substance in the list that is commonly exempted from requiring an import license into India.
This exemption is due to lactose's widespread use in the food industry and pharmaceuticals as a non-active ingredient, reducing concerns over safety and control compared to active pharmaceutical ingredients (APIs).