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: Pharmacology
The most impoant target of action of chlorambucil is - 
Select and explain. 
A. Myeloid tissue, B. Lymphoid tissue, C. Neural tissue, D. Skin
B: Lymphoid tissue
Answer: B: Lymphoid tissue 
Explanation: Ans. is 'b' i.e., Lymphoid tissue o Chlorambucil is a very slow acting alkylating agent especially active on lymphoid tissue; myeloid tissue is largely spared.