This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
True regarding colovesical fistula 
Select and explain. 
A. Most commonly presents with pneumaturia, B. Most commonly caused by colonic cancer, C. More common in females, D. Readily diagnosed on barium enema
A: Most commonly presents with pneumaturia
Answer: A: Most commonly presents with pneumaturia 
Explanation: .* Left sided growth presents with colicky pain, altered bowel habits (alternating constipation and diarrhoea), palpable lump, distension of abdomen due subacute/ chronic obstruction. Later may present like complete colonic obstruction. Tenesmus, with passage of blood and mucus, with alternate constipation and diarrhoea, is common. Bladder symptoms may warn colovesical fistula. ref:SRB&;s manual of surgery ,ed 3,pg no 838