identify the microorganism which is responsible for the production of an immunousuppressive molecule cyclosporin A :
Clostridium butylicum
Aspergillus niger
Streptococcus cerevisiae
Trichoderma polysporum
Cyclosporin A is used to treat RA. It reduces the activity of T-cells & thus suppresses the immune system. It is isolated from the Trichoderma polyparium.
Hence, Option (4) is correct.