Task: Question Answering
Input (English): Question: Regarding telomerases, which of the following statements is not true ?: 
 Options:  <1> They have reverse transcriptase activity. <2> They prevent shortening of telomeres. <3> Its defect promotes carcinogenesis. <4> Its activity is essential for the stability of chromosomes. <5> They are ribozymes.
Output (English): 3