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: Forensic Medicine
False Negative Hydrostatic test in a live born foetus may be seen in: 
Select and explain. 
A. Atelectasis, B. Aificial Respiration, C. Emphysema, D. Putrefaction
A: Atelectasis
Answer: A: Atelectasis 
Explanation: The hydrostatic test is false negative (the expanded lungs may sink) due to atelectasis, diseases like acute oedema, pneumonia, congenital syphilis, etc. Ref: The Essentials of Forensic Medicine and Toxicology By Narayan Reddy, 27th Edition, Page 384