Task: Question Answering
Input (English): Question: The recombinant DNA is: 
 Options:  <1> A DNA molecule that activates heterologous recombination. <2> A precursor messenger RNA molecule. <3> A DNA molecule composed of segments covalently linked from two or more sources. <4> A diploid DNA molecule. <5> A multienzyme complex of DNA polymerases covalently linked.
Output (English): 3