Mousy odour urine is seen in?
**Core Concept**
The question is related to the clinical presentation of a specific metabolic disorder, characterized by a distinct **mousy odor** of the urine. This condition is associated with an **inborn error of metabolism**, where the body is unable to properly break down certain amino acids. The underlying principle being tested is the ability to recognize and diagnose **phenylketonuria (PKU)** based on its clinical manifestations.
**Why the Correct Answer is Right**
Phenylketonuria (PKU) is a genetic disorder caused by a deficiency of the enzyme **phenylalanine hydroxylase**, which is necessary for the breakdown of the amino acid **phenylalanine**. When phenylalanine is not properly metabolized, it accumulates in the body and is converted into **phenylacetate**, a compound that gives urine a characteristic **mousy odor**. This distinctive odor is a key diagnostic clue for PKU.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not correspond to the correct answer for PKU.
**Option B:** Similarly, this option is not related to the condition characterized by mousy odor urine.
**Option C:** This choice is also incorrect as it does not match the disorder associated with the described odor.
**Clinical Pearl / High-Yield Fact**
It's crucial to recognize the signs of PKU early, as **untreated PKU** can lead to severe intellectual disability and other serious health problems. The mousy odor of urine is a classic, though not always present, sign that should prompt further investigation for PKU.
**Correct Answer:** D. Phenylketonuria.