**Question:** A most common cause of acute retention of urine in a child of 2 year age –

A. Urinary tract infection (UTI)
B. Congenital abnormalities
C. Neurological disorders
D. Bladder outlet obstruction

**Core Concept:**
Acute retention of urine in a child refers to a sudden inability to void urine, which can be caused by various factors. In the context of a 2-year-old child, we should consider the most common causes that are specific to this age group.

**Why the Correct Answer is Right:**
Among the given options, the correct answer is D. Bladder outlet obstruction. In young children, bladder outlet obstruction is a common cause of acute retention of urine due to the immature anatomy and physiology of the urinary system. In a 2-year-old child, the urethra is relatively short, and the prostate gland (in boys) or clitoral hood (in girls) can obstruct urine flow leading to retention.

**Why Each Wrong Option is Incorrect:**
A. Urinary tract infection (UTI) is not a common cause of acute retention of urine in a 2-year-old child, as UTI typically presents with symptoms like fever, vomiting, and irritability, which may be absent in an otherwise healthy child.
B. Congenital abnormalities are less common causes of acute retention in this age group compared to bladder outlet obstruction. While certain congenital anomalies may cause retention, they are not as frequently seen as bladder outlet obstruction in a 2-year-old child.
C. Neurological disorders are less likely to cause acute retention in a 2-year-old child, as they usually present with more complex neurological symptoms and signs. In contrast, bladder outlet obstruction is more straightforward and can occur in otherwise healthy children.

**Clinical Pearl:**
In a 2-year-old child presenting with acute retention of urine, it is essential to consider bladder outlet obstruction as the primary cause. Although other factors may be involved, focusing on bladder outlet obstruction allows for a more targeted approach in diagnosing and treating the issue promptly.

**Correct Answer:** D. Bladder outlet obstruction

**Why Each Wrong Option is Incorrect:**
A. Urinary tract infection (UTI)
B. Congenital abnormalities
C. Neurological disorders

**Why the Correct Answer is Right:**
Bladder outlet obstruction is the most common cause of acute retention of urine in a 2-year-old child. The urethral sphincter muscles are not yet fully developed in this age group, resulting in a narrowed urethral lumen and increased pressure within the bladder, causing retention. This can be due to factors such as enlarged prostate (in boys) or the clitoral hood (in girls). The obstruction leads to the inability of urine to flow out of the bladder, leading to retention. In contrast to older children and adults, neurological disorders and UTIs are less common causes of acute retention in a 2-year-old child.

**Clinical Pearl:**
When evaluating a 2-year-old child with acute retention of urine, focusing on bladder outlet obstruction is crucial