This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
All are true in definition of chronic bronchitis except: 
Select and explain. 
A. Cough 3 months, B. Productive cough, C. More than 2 consecutive months, D. Haemoptysis
D: Haemoptysis
Answer: D: Haemoptysis 
Explanation: Ans: dRef: Harrison, 15thed, p. 1491, CMDT, 2004 p. 232