Q. Which of the following fungi is the primary source of the antibiotic Penicillin?
Answer: Penicillium
Notes: Penicillin, one of the first antibiotics discovered, is derived from the fungus *Penicillium notatum* and *P. chrysogenum*. It revolutionized medicine by effectively treating bacterial infections, particularly those caused by Streptococcus and Staphylococcus species. Despite its historical significance, many bacteria have developed resistance to penicillin, highlighting the ongoing challenge of antibiotic resistance in modern medicine.