About 20 gms of hairs required to be preserved in
**Core Concept**
The question pertains to the forensic examination of hair samples, specifically the minimum amount required for preservation. In forensic science, hair analysis is used to identify individuals, determine the presence of certain substances, or assess the authenticity of a sample. The amount of hair required for analysis varies depending on the purpose and methods employed.
**Why the Correct Answer is Right**
The correct answer is 20 grams, which is a standard amount required for hair analysis in forensic science. This amount allows for thorough examination, including microscopic analysis, chemical testing, and other specialized techniques. The hair sample is typically collected from the head or body, and the 20-gram requirement ensures a sufficient amount for comprehensive analysis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the amount of hair required for analysis may vary depending on the specific tests or techniques employed. A smaller amount may be sufficient for certain types of analysis, but 20 grams is a standard minimum for comprehensive examination.
**Option B:** This option is incorrect because it is not a recognized standard for hair analysis in forensic science. The actual amount required may be different, and this option may be a distractor.
**Option C:** This option is incorrect because it is not a valid or recognized standard for hair analysis in forensic science. The actual amount required may be different, and this option may be a distractor.
**Clinical Pearl / High-Yield Fact**
In forensic science, hair analysis can provide valuable information, including the identification of substances such as narcotics, toxins, or other chemicals. The amount of hair required for analysis is typically 20 grams, which allows for thorough examination and comprehensive results.
**Correct Answer:** D. 20 grams