Ante-mortem hanging signifies the individual was alive during the event. The objective is to identify a sign of a vital reaction (a reaction of a living organism).
Step 1: Option Examination.
(1) Saliva Dripping: Saliva production is a physiological process in living individuals. Hanging can cause excess salivation due to pressure on salivary glands and nerve stimulation, resulting in saliva dripping down the chin and chest. This is a strong indicator of ante-mortem hanging.
(2) Femur Fracture: This is generally unrelated to hanging and not a vital reaction.
(3) Post-mortem Caloricity: This is a post-mortem phenomenon, an increase in body temperature after death, and not an ante-mortem sign.
(4) Vomit Presence: Vomiting, while possibly occurring before death, is not a specific or dependable indicator of ante-mortem hanging; it can have various causes.
Step 2: Conclusion. The most reliable indicator among the options confirming the hanging occurred while the individual was alive is saliva dripping due to vital physiological reactions.