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: Biochemistry
Which of the following is an effect of dinitrophenol on oxidative phosphorylation 
Select and explain. 
A. Inhibition of cytochrome b, B. Blockade of both electron transport and ATP synthesis, C. Inhibition of ATP synthesis with normal electron transport, D. Inhibition of electron transport but not ATP synthesis
C: Inhibition of ATP synthesis with normal electron transport
Answer: C: Inhibition of ATP synthesis with normal electron transport 
Explanation: Inhibition of ATP synthesis

Dinitrophenol is an uncoupler.
Uncouplers cause uncoupling of oxidation and phosphorylation, i.e. they allow electrons transport to proceed without ATP synthesis.