<prompt> In Primi, in Preterm Labour, which of the following can be used as Tocolytic a Ritodrineb MgSo4c Dexamethasoned Propranololacabadbc  <response>: Tocolytics are drugs to arrest preterm labor.In case of preterm labor main problem is lungs of the fetus are not mature so the main treatment is antenatal steroid injection to the mother ,but steroids require a minimum waiting period of 24 hours to act, so in the meanwhile tocolytics are given to arrest uterine contractions.Drugs with tocolytic effect but poor efficacy:Ethyl alcoholKDT 6e, p 319NitritesAtropinePhenothiazineGeneral anaesthetics 