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The heriditary disease in which the urin...

The heriditary disease in which the urine of a person turns black on exposure to air due to the presence of homogentisic acid is known as

A

Ketonuria

B

Phenylketonuria

C

Haematuria

D

Alkaptonuria

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question:** The question asks for a hereditary disease characterized by the urine turning black upon exposure to air due to the presence of homogentisic acid. 2. **Identifying the Options:** The options provided are: - Ketoneuria - Phenylketonuria - Haematuria - Alkaptonuria 3. **Analyzing Each Option:** - **Ketoneuria:** This condition involves the presence of ketone bodies in urine, often associated with diabetes mellitus. It does not relate to black urine. - **Phenylketonuria:** This is a metabolic disorder where the body cannot break down phenylalanine, leading to its accumulation. It does not cause black urine. - **Haematuria:** This condition refers to the presence of blood in urine, which is unrelated to the black coloration caused by homogentisic acid. - **Alkaptonuria:** This is the correct condition. It is characterized by the presence of homogentisic acid in the urine, which oxidizes and turns black when exposed to air. 4. **Conclusion:** Based on the analysis, the hereditary disease in which the urine of a person turns black on exposure to air due to the presence of homogentisic acid is known as **Alkaptonuria**. ---
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