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: Pharmacology
Dose-response curve in Hormesis ? 
Select and explain. 
A. Straight line, B. Sigmoid, C. Inveed U or J shaped, D. Hyperbola
C: Inveed U or J shaped
Answer: C: Inveed U or J shaped 
Explanation: Ans. is 'c' i.e., Inveed U or J shaped Hormesis is a dose response phenomenon in which low doses have stimulatory effect while high doses have inhibitory effect. The dose response curve may be J-shaped or inveed U shapted, the latter being observed, for example, with the effect of chemotactic peptides on neutrophil adhesion.