Task: Question Answering
Input (English): Question: Which of these vitamins are isoprenoid compounds? 
 Options:  <1> Vitamins A, B2, C and D. <2> Vitamins A, B2 and Folic acid. <3> Vitamins A, K and biotin. <4> Vitamins D, E and C. <5> Vitamins A, D, E and K.
Output (English): 5