This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
Tumor invades muscularis propria and 2 lymph nodes involved. TNM staging is 
Select and explain. 
A. T2 N1, B. T2 N2, C. T3 N1, D. T3 N2
A: T2 N1
Answer: A: T2 N1 
Explanation: T1 Invades submucosaT2Invades muscularis propriaT3Invades through the muscularis propria into pericolrectal tissuesT4aInvades through the visceral peritoneumT4bDirectly invades to adjacent organs or structuresN1aOne node positiveN1b2-3 nodes positiveN1cNo regional lymph nodes positive, but there are tumour deposits in the subserosa, Mesentry or non peritonealized pericolic/ perirectal/ mesorectal tissues N2a4-6 lymph nodes positiveN2b7 or more lymph nodes positiveM1aMetastasis to one site or organ, without peritoneal metastasisM1bMetastasis to 2 or more sites or organs without peritoneal metastasisM1c Metastasis to the peritoneal surface (alone or along with other site/organ)Ref: AJCC 8e