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: Dental
[{'content': 'The effect of sucking habit \nSelect and explain. \nA. Is less favourable in vertical growth tendency than horizontal growth tendency., B. Is less favourable in horizontal growth tendency than vertical growth tendency., C. Any of the above can be true, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]