Graduate Pharmacy Aptitude Test (GPAT) 2012 Solved Paper

Study the following statements on prevention of crystalluria. By the given approaches crystalluria can be prevented
[P] : By co-administration of sulfadiazine, sulfamerazine and sulfamethazine
[Q] : By increasing the pH of urine
[R] : By co-administration of sulphanilamide, sulphamethoxazole and folic acid
[S] : By administration of co-trimoxazole
Choose the correct combination of statements.