Most common cause of urethral stricture is:
**Core Concept**
The underlying principle being tested is the etiology of urethral stricture, which is a narrowing of the urethra due to scarring. This condition can result from various causes, including traumatic, infectious, and iatrogenic factors. Urethral stricture disease is a significant cause of lower urinary tract symptoms in men.
**Why the Correct Answer is Right**
The most common cause of urethral stricture is iatrogenic, particularly due to instrumentation such as catheterization. However, traumatic injuries, especially those involving pelvic fractures, are also a significant cause. The correct answer is related to trauma, as it is a leading cause of urethral stricture, especially in young men.
**Why Each Wrong Option is Incorrect**
**Option A:** Infections such as gonorrhea can cause urethral stricture, but they are not the most common cause.
**Option B:** While iatrogenic causes are common, the specific option provided does not match the most frequent etiology.
**Option D:** Other causes like congenital conditions are less common than traumatic or iatrogenic causes.
**Clinical Pearl / High-Yield Fact**
Urethral stricture disease often presents with obstructive urinary symptoms such as weak stream, straining to urinate, and urinary retention. Diagnosis is typically made with a combination of history, physical examination, and imaging studies like retrograde urethrogram.
**Correct Answer:** D. Trauma