The correct option is
B ClavicepsErgot are the alkaloids obtained from ergot fungi Claviceps purpurea which grow on rye plant. These fungi cause ergot of rye, a fungal disease in plants. The sclerotia of ergot fungi contain alkaloids which are used to produce LSD (Lysergic acid diethylamide) drugs that act on CNS (Central nervous system). They are natural hallucinogens and change mood, behaviour and thoughts like in psychosis, a condition in which thoughts and emotions are affected to such an extent that contact is lost with reality.
So, the correct answer is 'Claviceps'.