Pregnancy tests and other diagnostic tests use monoclonal antibodies. What property of monoclonal antibodies makes them useful in these tests?

• AThey glow under UV light when fresh
• BThey are produced from a single type of B-cell, so they all bind to one specific antigen
• CThey are smaller than ordinary antibodies
• DThey are produced inside the test, not in a lab

Choose an answer — or press 1234