Multiple choice Which of the following is a pair of neutrophiles only? Picrophilus and Sulfolobus Escherichia and Paramecium Alicyclobacillus and Natronobacterium Picrophilus and Paramecium Escherichia and Natronobacterium Reveal answer Fill a bubble to check yourself B Correct answer Explanation Yes, it is correct. Escherichia and Paramecium: Neutrophiles (optimum growth between pH 5.5 and 8.0).