You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Q: Question: Mike needed to get a dark picture . In order to get the darkest photo, Mike made the exposure 
 Option1: longer 
 Option2: shorter 
 Explanation: The longer the exposure, the more light that the telescope can gather to make the image.

A: shorter
****
Q: Question: Do electric cars pollute more or less than gas cars? 
 Option1: more 
 Option2: less 
 Explanation: Plug-in hybrids run for a longer time on electricity and so are less polluting than regular hybrids.

A: less
****
Q: Question: Jeff should add _____ to his engine to reduce the friction in its processes. 
 Option1: oil 
 Option2: gas 
 Explanation: To reduce friction, oil is added to the engine.

A:
oil
****