In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: In a three-point test crossover study, a negative interference indicates that: 
 Options:  <0> More double crossings have occurred than expected. <1> There have been fewer double crossings than expected. <2> The match coefficient is less than 1. <3> A simple crossover decreases the likelihood of a double crossover occurring. <4> There have been fewer simple cross-links than expected.
biology

Question: The reaction between a ketone and a Grignard reagent causes, after hydrolysing the salt formed, a: 
 Options:  <0> Carboxylic ester. <1> Alcohol. <2> Ether. <3> Aldehyde. <4> Carboxylic acid.
chemistry

Question: In the kidney, sympathetic stimulation increases: 
 Options:  <0> The renal excretion of sodium. <1> The renal excretion of water. <2> The radius of the afferent arteriole. <3> Glomerular filtration. <4> The release of renin.

biology