Given below are two statements :
Assertion (A): According to the World Health Organization (WHO) in 1993, there were 16.5 million deaths due to infectious diseases worldwide.
Reason (R): Urbanisation without health planning leads to the spread of diseases.
Select from the codes given below:

1. A.Both (A) and (R) are true and (R) is the correct explanation of (A).
2. B.Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. C.(A) is true but (R) is false.
4. D.(A) is false but (R) is true.