This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Carrier who receives organisms from other carrier 
Select and explain. 
A. Contact carrier, B. Paradoxical carrier, C. Convalasent carrier, D. Chronic carrier
B: Paradoxical carrier
Answer: B: Paradoxical carrier 
Explanation: convalascent carrier -those who continue to shed the disease agent during the period of convalscence eg.typhoid fever,dysentery chronic carrior -one who excreats infections for indefinite periods eg.hepatitis B,Typhoid fever (park,edition 23,page 96) contact carrier -person who acquires pathogen from a patient paradoxical carrier-person who acquires pathogen from another carrier (textbook of microbiology,anandanarayanan & paniker,edition 9,page 72)