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: Pathology
Mercury affects which pa of the kidney 
Select and explain. 
A. >PCT, B. DCT, C. >Collecting duct, D. >Loop of Henle
A: >PCT
Answer: A: >PCT 
Explanation: PCT Pattern in Acute tubular necrosis Ischemic type Tubular necrosis is patchy, relatively sho lengths of tubules are affected Straight seg. of proximal tubules and ascending limb of Henle's loop are most vulnerable Toxic necrosis Mercury PCT is mainly involved Lead Entire tubule is damaged