Answer:
a. AB+
Explanation:
In emergency situations, when the recipient's blood Type is unknown, the person can receive Type O negative red cells without producing an ABO or RhD incompatibility reaction. In other situations, even non-emergent, where the recipient's specific blood Type is own but there is no Type-specific blood available, a compatible Type may be used if determined to be compatible by cross - matching. Cross matching is a simple and commonly practiced laboratory test that verifies blood compatibility. In the later instance, for example if an AB+ recipient needs blood and there are no AB+ donors, they could receive blood from a Type A positive donor after a proper cross - match.
