Which of the following is a partial root parasite?

Sandalwood is a partial root parasite. Mistletoe (Viscum) is considered as hemiparasite which derives a part of nourishment from host plant. Orobanche is a holoparasite which infects species from favciae i.e., beans, ioranlhus. Ganodermna are parasite for example basidiocarpic mushrooms.

Hence the correct answer is option (a).