challenge: Which of the following innovations was NOT cited as a major contribution by Khondkar Siddique-e-Rabbani according to the Bangladesh Academy of Sciences?
  
  A. Surface water free of Arsenic that can be made drinkable
  B. A nerve conduction measurement technique ‘Distribution of F-latency (DFL) for nerve fibres
  C. A simple and low cost method to destroy diarrhoeal germs in water using solar radiation
  D. A localised electrical impedance technique named ‘Focused Impedance Method (FIM) for medical conditions
  Answer: 