उत्तर : 2. "स्ट्रेप्टोमाइसिन"
व्याख्या :

Waksman's being awarded the Nobel Prize for Physiology or Medicine in 1952. Dr. Waksman's studies had led to the discovery of streptomycin, a new antibiotic. Streptomycin was the first effective cure for tuberculosis (TB).