Those fungi which can grow only on their living host and cannot be grown on available defined growth culture medium e.g. various mildews and most rust species are called_____________?

Those fungi which can grow only on their living host and cannot be grown on available defined growth culture medium e.g. various mildews and most rust species are called_____________?

A. Parasitic fungi
B. Obligate parasitic fungi
C. Facultative parasitic fungi
D. All of these