Taq polymerase is isolated from:

Thermus aquaticus

The correct answer is Option (2) → Thermus aquaticus

Taq polymerase is the heat-stable (thermostable) DNA polymerase extracted from the thermophilic bacteria Thermus aquaticus. Its predominant function is in the polymerase chain reaction (PCR) technique, where it automates the repetitive step of amplifying specific DNA sequences. The polymerase chain reaction can multiply DNA molecules by up to a billion-fold. This produces large quantities of specific genes with downstream use across multiple applications.