Choose the wrong statement. Neurospora is used in the study of biochemical genetics. Morels and truffles are poisonous mushrooms. Yeast is unicellular and useful in fermentation. Penicillium is multicellular and produces antibiotics.

A. Yeast is a unicellular i.e. single-celled and non-mycelial saprophytic fungus. In anaerobic conditions, yeast converts sugar into alcohol with the release of carbon dioxide and some energy. Due to this, yeast is used in a fermentation process. Hence, statement A is correct.
B. Penicillium is a saprophytic fungus belonging to Ascomycetes. The mycelium is profusely branched and septate. Cells are thin walled with many nuclei in them. Thus, it is multicellular. Penicillin is an antibiotic produced from Penicillium. Hence, statement B is correct.
C. Neurospora has a short life cycle and hence, it is used in genetical and biochemical studies. Hence, statement C is correct.
D. Morels or Morchella, commonly known as a sponge mushroom produces fruiting body basidiocarp which is edible. Truffles are the ascomycetes which also produce edible fruiting bodies. Hence, statement D is incorrect.
So, the correct answer is 'Morels and truffles are poisonous mushrooms'.