Digitalis, used to treat heart conditions, was discovered through observing that foxglove plants had medicinal effects. Which modern source of drugs follows the same principle?

• Acomputer modelling of synthetic molecules
• Brational drug design based on protein crystal structures
• Cbioprospecting - screening plant, microbial, or marine organisms used in traditional medicine for pharmacologically active compounds
• Dcombinatorial chemistry - randomly generating millions of synthetic molecules for screening

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