This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Which of the following is the usual presenting symptom of pseudocyst in pancreatitis? 
Select and explain. 
A. Abdominal swelling, B. Abdominal pain, C. Persistent vomiting, D. Early satiety and postprandial fullness
B: Abdominal pain
Answer: B: Abdominal pain 
Explanation: Pseudocysts are caused by pancreatitis in 90% of cases and by trauma in 10%. Approximately 85% are located in the body or tail of the pancreas. Some patients have two or more pseudocysts. Abdominal pain is the usual presenting complaint. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 2642