( Infections ( ( ( ( caused ( by ( a ( protozoan parasite ) ) ) ) , ) ( -LRB- ( trichomoniasis ( -RRB- ( produce ( a ( yellowish ( , ( frothy ( , ( foul-smelling discharge ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Infections)) (VP (VBD caused) (PP (IN by) (NP (DT a) (NN protozoan) (NN parasite))) (, ,) (S (-LRB- -LRB-) (NP (NNS trichomoniasis)) (-RRB- -RRB-) (VP (VB produce) (NP (DT a) (JJ yellowish) (, ,) (JJ frothy) (, ,) (JJ foul-smelling) (NN discharge))))) (. .)))
Infections caused by a protozoan parasite, ( trichomoniasis ) produce a yellowish, frothy, foul-smelling discharge.
(ROOT (S (NP (NNS Trichomoniasis)) (VP (VBZ is) (VP (VB cause) (PP (IN by) (NP (DT a) (NN protozoa))))) (. .)))