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“Causation” is an essential element of a tort action. Defendants are not liable unless their conduct such as the act or omission constituting a breach of duty to plaintiff was a “legal cause” of plaintiff’s injury. [Saelzler v. Advanced Group 400 (2001). Legal causation is generally a question of fact to be determined by the jury … unless, as a matter of law, the facts admit of only one conclusion. [Ortega v. Kmart Corp. (2001)]. The burden of proving lack of causation is properly shifted to a defendant who, being.