This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'In varicella infection which is not true- \nSelect and explain. \nA. Scabs are highly infective, B. Caused by herpes virus, C. Transmitted by oro-pharyngeal secretions, D. Vesicles are centripetal in distribution', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]