This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
[{'content': 'Lanugo hair appears at: \nSelect and explain. \nA. 4 months, B. 5 moths, C. 6 months, D. 7 months', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (4 months) (43-Dutta 6th) (2154-Nelson 17th)* At 16th week (4 month) lanugo (downy thin colourless hairs) appears but near term almost completely disappears.The homy layer of epidermis is absent before 20th week.', 'role': 'assistant'}]