Task: Question Answering
Input (English): Question: The muscle relaxant suxetonium (succinylcholine), which was designed from decamethonium by substitution of two ethylene groups by two ester functions, susceptible to a hydrolytic metabolism, is a: 
 Options:  <1> Prodrug <2> Hard drug. <3> Apolar drug. <4> Chiral drug. <5> Soft drug
Output (English): 5