system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Tell me if this a universal blood group:  A+, A-,  B+, B-,  O+, O-,  AB+, AB-


assistant
A+ = No
A- = No
B+ = No
B- = No
O+ = No
O-  = Yes
AB+= No
AB-= No