This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary Bladder, Subject name: Surgery
Which of the following is a sequel of schistosomiasis of bladder 
Select and explain. 
A. Squamous cell carcinoma, B. Adenocarcinoma, C. Lymphoma, D. Sarcoma
A: Squamous cell carcinoma
Answer: A: Squamous cell carcinoma 
Explanation: Ans. is 'a' i.e., Squamous cell carcinoma * The adult S. haematobium worm lives in the prostatovesical plexus of veins. The female worm lays her eggs in the subepithelial layers of the affected viscus.* Massive egg deposition leads to severe local reaction with granuloma formation. These are later replaced by fibrous tissue that causes contraction of different parts of the bladder and stricture of ureter.* Fibrosis and massive egg deposition interfere with the blood supply of area causing chronic bilharzial ulcerations.* Epithelial metaplasia is common and squamous cell ca is a frequent sequele.* Transitional cell carcinoma may also arise.* Schistosoma hematobium is a risk factor for both TCC & SCC