Pathology Very low activity of adenosine deaminase in sample of red cells and high levels of dATP is consistent with diagnosis of- A Organophosphorus poisoning B Severe combined immunodeficiency disease C Cyanide poisoning D Acquired immunodeficiency disease 💡 Explanation Very low activity of adenosine deaminase in sample of red cells and high levels of dATP is consistent with diagnosis of- ✓ Correct Answer: B. Severe combined immunodeficiency disease