A sample 'X' of food colouring was tested by chromatography. The chromatograms for four dyes P, Q, R and S are also given below: . . - X Р R S. Which of the following statements is correct? A. X contains only two dyes P and S. B. X contains only Q but not P, R and S. C. X contains P, Q and R but not S. D. X does not contain Q and R but contains only P.
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