In which layer of the intestinal wall does the mucosal damage occur in Crohn's disease?
1) Mucosa
2) Submucosa
3) Muscularis propria
4) Serosa
📝 Explanation:
Crohn's disease primarily affects the mucosa and submucosa, but can involve all layers of the intestinal wall, leading to the characteristic features such as aphthous ulcers and granulomas.