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
The heavy metal poisonng from mercury affects which pa of the renal tubule? 
Select and explain. 
A. PCT, B. DCT, C. CT, D. Loop of Henle
A: PCT
Answer: A: PCT 
Explanation: Mercury poisoning leads to membranous nephropathy which primarily causes necrosis of proximal convoluted tubular epithelium. Inorganic mercury affects the proximal tubules and cause vesiculation and exfoliation of brush border membrane , followed by calcium influx and cell death. Ref: The Essentials of Forensic Medicine And Toxicology by Dr. K. S. Narayan Reddy 27th edition; Pages 476 - 478; Heptinstall's Pathology Of The Kidney, Volume 1 By J. Charles Jennette page 1122; Robbins textbook of Basic Pathology 7th edition; pages 476 - 478.