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 a characteristic feature of Henoch-Schonlein Purpura? 
Select and explain. 
A. Blood in stool, B. Thrombocytopenia, C. Intracranial hemorrhage, D. Susceptibility to infection
A: Blood in stool
Answer: A: Blood in stool 
Explanation: Henoch-schonlein purpura is a small vessel vasculitis characterized by palpable purpura ahralgias, gastrointestinal signs and symptoms, glomerulonephritis. Gastrointestinal involvement is characterized by colicky abdominal pain, nausea, vomiting, diarrhea, or constipation and frequently associated with passage of blood and mucus per rectum. Ref: Harrisons Internal Medicine, 18th Edition, Chapter 326