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: Skin
[{'content': 'Parakeratosis is defined as: \nSelect and explain. \nA. Retention of cytoplasmic contents in stratum corneum, B. Retention of nuclei in stratum corneum, C. Increased thickness in stratum corneum, D. Decreased thickness of stratum corneum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Increased thickness in stratum corneum', 'role': 'assistant'}]