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: Physiology
A patient with A -ve blood group can receive blood from: 
Select and explain. 
A. O positive donor, B. B negative donor, C. AB positive donor, D. A negative donor
D: A negative donor
Answer: D: A negative donor 
Explanation: None