Muslim doctors made discoveries about a blood circulation
b organ transplants
c immunizations
d brain surgery

C

Explanation:

Islamic doctors developed new techniques in medicine, dissection, surgery and pharmacology. They founded the first hospitals, introduced physician training and wrote encyclopaedias of medical knowledge.

answer///cannot be totally predicted;

depends where it is? i got mine on my arm and from 1-10 it was a 3 different spots react differently