Categorize the clinical manifestations with the most appropriate gastrointestinal condition.

Crohn's disease: Onset can be gradual Inflammation that can occur in any part of the gastrointestinal tract Diarrhea that may or may not be bloody Ulcerative colitis: Often more acute onset Bloody diarrhea (hematochezia) is a hallmark sign Inflammation of the innermost layer of the colon and rectum Rationale: Crohn's disease: Onset can be gradual: Symptoms in Crohn’s disease often develop slowly over weeks to months, making early recognition challenging and contributing to chronic inflammation. Inflammation that can occur in any part of the gastrointestinal tract: Crohn’s disease can affect the entire GI tract, including the small intestine, colon, and even mouth, leading to patchy areas of inflammation known as “skip lesions.” Diarrhea that may or may not be bloody: Stool characteristics vary depending on the site and severity of inflammation; some patients have non-bloody diarrhea while others may have blood if the colon is involved. Ulcerative colitis: Often more acute onset: Symptoms such as abdominal pain, urgency, and diarrhea can appear suddenly, sometimes within days, reflecting rapid mucosal inflammation. Bloody diarrhea (hematochezia) is a hallmark sign: Continuous mucosal ulceration in the colon leads to bleeding, making bloody stools a classic presentation of ulcerative colitis. Inflammation of the innermost layer of the colon and rectum: Ulcerative colitis primarily affects the mucosa and submucosa of the colon and rectum, unlike Crohn’s disease which can involve all layers of the bowel wall.