Task: Text Categorization
Input (English): Question: The system in T: 
 Options:  <0> It is present in all muscle cells without exception. <1> It is part of the sarcoplasmic reticulum. <2> It has an ATPase activated by Ca2 +. <3> It is a tubular invagination of the plasma membrane. <4> Releases Ca2 + to the cytosol during recruitment.
Output (English): biology