Assertion: manganese's effect | /r/HasProperty | drowsiness
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Source sentences:
text: Other effects include weakness, delusions, compulsions, rigidity, bradykinesia, sudden crying, stuttering, hoarse voice, nervousness, inability to walk backward, hyporeflexia, Romberg's sign, adiadochokinesia, forgetfulness, general malaise, drowsiness, stiffness of the arms or legs, urinary difficulty, somnolence, sexual excitement followed by impotence, "hen's gait" and frequent falling.