Minimal level of iodine at consumer level should be….. ppm:

**Core Concept**
Iodine is an essential micronutrient required for the synthesis of thyroid hormones, which regulate metabolism, growth, and development. The minimal level of iodine in drinking water, salt, or other consumer products is crucial to prevent iodine deficiency disorders, such as goiter, hypothyroidism, and cretinism.

**Why the Correct Answer is Right**
The recommended minimum level of iodine in consumer products, including salt, is 15 ppm (parts per million). This concentration is sufficient to meet the daily iodine requirements of most adults and children. The thyroid gland absorbs iodine from the bloodstream and uses it to produce thyroxine (T4) and triiodothyronine (T3), which are essential for maintaining normal metabolic function.

**Why Each Wrong Option is Incorrect**
**Option A:** 5 ppm is too low to meet the daily iodine requirements of most adults and children, increasing the risk of iodine deficiency disorders.
**Option B:** 25 ppm is excessively high and may cause iodine toxicity, leading to symptoms such as hyperthyroidism, thyroid nodules, and goiter.
**Option C:** 10 ppm is below the recommended minimum level and may not provide adequate iodine for individuals with increased requirements, such as pregnant or lactating women.

**Clinical Pearl / High-Yield Fact**
The World Health Organization (WHO) recommends a minimum of 15 ppm of iodine in consumer products to prevent iodine deficiency disorders. This is a critical public health measure to ensure adequate thyroid hormone production and prevent related health issues.

**Correct Answer: C. 10 ppm.**