This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Urethra & Penis), Subject name: Surgery
A patient was brought to the hospital with a history of RTA eight hours back. A few drops of blood is noted at the external urethral meatus. He has not passed urine and his bladder is palpable per abdomen. The probable diagnosis is : 
Select and explain. 
A. Urethral injury, B. Rupture bladder, C. Urethral injury with extravasation of urine in the retroperitoneum, D. Anuria due to hypovolemia
A: Urethral injury
Answer: A: Urethral injury 
Explanation: Ans. is 'a' i.e. Urethral injury Blood at urethral meatus and urine retention are suggestive of urethral injury.