This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach, Subject name: Pathology
In early gastric carcinoma malignancy is confined to: 
Select and explain. 
A. Mucosa, B. Mucosa and submucosa, C. Gastric wall without lymph node metastasis, D. Gastric glands
B: Mucosa and submucosa
Answer: B: Mucosa and submucosa 
Explanation: Early gastric cancer: Tumor confined to mucosa and submucosa Late gastric cancer: Tumor penetrating into muscle layer and may even extend into serosa