A brief reading of the sentences tells us that the paragraph must be about the industry of neuromarketing, which is still in its embryonic phase. 3 can be the opening sentence to the paragraph, as it introduces the topic at hand. All the other sentences need a sentence before them that introduces what is being talked about. 1,4, and 2 then go on to talk about the opinion of different associated parties on the matter. It has taken the advertising industry by storm. Others feel that this 'art' is being masked as a science, and many lack enthusiasm on the matter. 5 however, does not fit in here. The reason is that it talks about 'psychology', which is different from the use of neural science. Even if one is not familiar with the difference, we can see that it goes a step forward to talk about the application of a science, whereas the paragraph is mostly concerned with a growing science and how it is shaping public opinion. Hence, 5 is the odd one out.