Final answer:
The first action a PCT should take when witnessing a chemical spill with visible smoke in a patient's room is to evacuate the room and call for help to ensure safety (option A).
Step-by-step explanation:
In the event of a chemical spill in a patient's room accompanied by a strong smell and visible smoke, the most immediate action to take is A) Evacuate the room and call for help. Safety protocols emphasize the urgency of removing any persons from potential harm and seeking assistance from those trained to handle chemical spills. This step should precede ventilation efforts, patient assessments, and documentation processes, which can be addressed after ensuring everyone's safety.
Hence, the answer is option A>