<prompt> Which one of the following is true of hyaline membrane disease of the newbornPrematurity provides relative protection of the occurrenceMaternal steroid exposure increase severity of the diseasePhosphatidyl glycerol estimation is a reliable method of diagnosisSurfactant increases the surface tension of a iveoli  <response>: In HMD surfactant is reduced and its measurement can be used for diagnosis e.g. in shake test.Constituent of surfactant are - dipalmitoyl phosphatidylcholine lecithin, phosphatidylglycerol, apoproteins surfactant proteins SPA, SPB, SPC, SPD and cholesterol. 