How many of the following drugs is/are example(s) of broad spectrum antibiotic? Ofloxacin, Penicillin G, Terpineol, Salvarsan

We need to determine how many of the given drugs are examples of broad spectrum antibiotics: Ofloxacin, Penicillin G, Terpineol, Salvarsan.

Ofloxacin: It is a fluoroquinolone antibiotic. It is effective against both Gram-positive and Gram-negative bacteria. Therefore, it is a broad spectrum antibiotic.

Penicillin G: It is primarily effective against Gram-positive bacteria. It is classified as a narrow spectrum antibiotic.

Terpineol: It is an antiseptic/disinfectant, not an antibiotic at all. So it is not a broad spectrum antibiotic.

Salvarsan: It is an organoarsenic compound used to treat syphilis (caused by a specific bacterium). It is not a broad spectrum antibiotic; it targets specific organisms.

Only Ofloxacin qualifies as a broad spectrum antibiotic.

Therefore, the number of broad spectrum antibiotics is $$\boxed{1}$$.